Pediatric Dental Fillings

Introduction

If your child has been told they have a cavity, or you have noticed a dark spot, chip, or sensitive tooth, a dental filling is often the next step. Fillings are one of the most common treatments in pediatric dentistry. They stop decay from spreading, take away pain, and let the tooth keep doing its job — chewing, holding space for the adult tooth that will follow, and helping with clear speech.

This guide is written for parents. It explains what pediatric dental fillings are, when dentists recommend them, the different materials used, what happens during the visit, how to help your child recover, and what to do to keep new cavities from forming. It also covers the situations where a filling is not enough and other options may be considered, such as a small crown or a medicine that can slow decay without drilling.

Baby teeth matter. They are not just placeholders. A cavity in a baby tooth can cause pain, infection, and crowding of the adult teeth that come in later. Treating cavities early, gently, and in a way that feels safe for your child is the goal of pediatric restorative care.

What Are Pediatric Dental Fillings?

A dental filling is a restoration. The dentist removes the part of the tooth that has been damaged by decay (the cavity) and replaces it with a material that seals the tooth and rebuilds its shape. This protects the deeper layers of the tooth, including the nerve, from infection.

In children, fillings are placed in two types of teeth:

• Primary teeth (baby teeth) — these begin to appear around six months of age and are usually all in place by age three. They start falling out around age six and continue to be replaced through about age twelve.
• Young permanent teeth — the first adult molars usually come in around age six, followed by other permanent teeth through the teenage years. These teeth are still maturing for some time after they erupt.

Children’s teeth are not just smaller adult teeth. The enamel (the hard outer layer) is thinner. The nerve inside the tooth is closer to the surface. Decay can spread faster. For these reasons, pediatric fillings are planned a little differently from adult fillings: the choice of material, the way the tooth is prepared, and how the visit is structured all take the child’s age, behaviour, and stage of dental development into account.

Pediatric dental fillings are sometimes called restorations in dental notes. You may also see related terms such as composite restoration, glass ionomer restoration, or preventive resin restoration. These all refer to slightly different types of fillings, which are explained later in this article.

Why Dental Fillings Are Performed in Children

The main reason a child needs a filling is dental caries — the medical name for tooth decay. Decay happens when bacteria in the mouth turn sugars from food and drink into acid. The acid slowly dissolves the enamel and the layer below it (the dentin), creating a cavity. Without treatment, the cavity grows larger and can reach the nerve, causing pain and infection.

Dentists commonly place fillings in children for the following reasons:

• Visible cavities — a hole, soft spot, brown or black mark on the tooth
• Tooth pain or sensitivity to cold, sweet, or hot foods
• Decay detected on X-rays between the teeth, where parents cannot see it
• Chipped or fractured teeth from a fall or injury
• Deep grooves or pits on the chewing surface where early decay has begun
• Defects in the enamel from conditions such as molar incisor hypomineralisation, where the enamel did not form properly

Treating these problems early avoids more involved care later. A small cavity that is filled in one visit can otherwise become a deep cavity that requires a pulpotomy (a treatment of the nerve), a crown, or in some cases the removal of the tooth.

Which Children Need Fillings?

A pediatric dentist considers several factors before deciding whether a filling is the right next step, including how deep the cavity is, which tooth is affected, how long that tooth is expected to remain in the mouth, and how cooperative the child is likely to be during treatment.

Common situations where a filling is recommended

• A cavity in a primary molar that is expected to stay in the mouth for several more years
• A cavity in a newly erupted permanent tooth
• Early decay that has gone past the enamel into the dentin
• A small fracture that has exposed the inner tooth structure

Situations where a filling alone may not be enough

• Decay that has reached or nearly reached the nerve — nerve treatment (pulpotomy or pulpectomy) may be needed first, followed by a crown
• Large cavities on multiple surfaces of a baby molar — a stainless steel crown often holds up better than a large filling
• A baby tooth that is close to falling out anyway — the dentist may choose to monitor it rather than fill it
• Very early decay that has not yet broken through the enamel — remineralising treatments with fluoride varnish may be tried before a filling

Children at higher risk of decay — for example, those with frequent sugary snacks, bottle-feeding past infancy, certain medical conditions, special healthcare needs, or limited access to fluoride — may need more preventive care alongside fillings, including sealants and fluoride applications.

Alternatives to Fillings

A filling is not always the only option. Pediatric dentistry has moved towards approaches that match the treatment to the size of the cavity, the child’s age, and how cooperative the child is. The American Academy of Pediatric Dentistry (AAPD) and other professional bodies describe a range of options.

Remineralisation with fluoride

For very early decay — a white spot in the enamel that has not yet become a hole — fluoride varnish applied at the dental visit, along with fluoride toothpaste at home, can sometimes reverse the damage. The tooth is not drilled. This option is only suitable for very early lesions.

Silver diamine fluoride (SDF)

SDF is a liquid medicine that the dentist paints onto a cavity. It can stop the decay from getting bigger and is painless to apply. The main side effect is that it turns the decayed area black. Major pediatric dental societies, including the AAPD, describe SDF as a useful option for young children who are not able to sit through a filling, for children with many cavities where staged treatment is needed, and for back teeth where the black colour is less visible. SDF does not rebuild the tooth, so a filling or crown may still be placed later.

Dental sealants

Sealants are thin plastic coatings painted onto the deep grooves of the back teeth. They are a preventive treatment, not a filling. They are used to stop decay from starting in healthy teeth. If a cavity has already formed, a sealant alone is usually not enough.

Stainless steel crowns

For large cavities on baby molars, or after nerve treatment, dentists often use a pre-formed silver-coloured cap called a stainless steel crown. It covers the whole tooth and tends to last until the baby tooth falls out naturally. White (zirconia) crowns are also available for front teeth and, in some clinics, for back teeth where appearance matters more.

Hall technique

This is a way of placing a stainless steel crown over a decayed baby molar without drilling or removing the decay. It seals the cavity off from the bacteria’s food supply, which arrests the decay. It is used selectively, and not every cavity is suitable. Pediatric dentists trained in the technique may suggest it for cooperative children with certain types of cavities.

Extraction

Occasionally, a baby tooth is too damaged to save, or it is close to falling out anyway. The dentist may suggest removing it. If the tooth is removed early, a small appliance called a space maintainer may be placed to hold room for the adult tooth.

Which of these options is suitable depends on the individual tooth and child. The dentist will explain the choices and the reasons behind their recommendation.

Types of Filling Materials Used in Children

Composite resin (tooth-coloured fillings)

Composite resin is a tooth-coloured plastic and glass material. It is the most common choice for visible teeth and is widely used for both baby and permanent teeth. The dentist places it in layers, hardening each layer with a blue light. Composite bonds well to the tooth and looks natural.

Composite works best when the tooth can be kept dry during placement. In a young child who has trouble sitting still, this can be challenging for back teeth. Composite fillings can last many years on permanent teeth when oral hygiene is good.

Glass ionomer cement

Glass ionomer is a tooth-coloured material that bonds chemically to the tooth and slowly releases fluoride, which can help protect the surrounding tooth structure. It does not need a perfectly dry environment, which makes it useful for younger children and for teeth that are hard to isolate.

It is not as strong or as wear-resistant as composite, so it is often used for baby teeth, for small fillings in areas with less chewing force, or as a temporary or interim restoration.

Resin-modified glass ionomer

This is a hybrid material. It has the fluoride-releasing and easier-handling properties of glass ionomer but is reinforced with resin for better strength and appearance. It is commonly used in pediatric dentistry as a middle-ground option.

Stainless steel crowns

As mentioned above, these are not fillings in the strict sense, but they are part of the same family of restorations. They are pre-formed metal caps used when a large filling would not hold up. They are commonly placed on baby molars after deep decay or nerve treatment.

Dental amalgam (silver fillings)

Amalgam is a silver-coloured filling made from a mixture of metals including mercury. It has been used for more than a century and is very durable. In many countries, the use of amalgam in children has been reduced or phased out under international agreements that aim to lower mercury use in dentistry. Most pediatric dentists today favour tooth-coloured alternatives for children. If amalgam is being considered, the dentist will explain why.

How the Filling Visit Is Prepared

How a child is prepared for a filling visit depends on their age, temperament, and any past experiences with the dentist. Pediatric dentists are trained in behaviour guidance — a set of communication techniques that help children feel calm and cooperative.

Before the visit

• Use simple, positive language at home. Avoid words like “needle,” “drill,” “pain,” or “shot.” Many dental teams have their own gentler words for these things.
• Read a children’s book about visiting the dentist, or watch a friendly video together.
• Schedule the appointment when your child is usually rested and not hungry — mid-morning often works well for younger children.
• Let your child bring a comfort item if it helps — a soft toy, a blanket, or headphones for music.
• Stay calm yourself. Children pick up on a parent’s worry.

At the clinic

The dentist or hygienist will usually take a few minutes to show your child the tools using kid-friendly names — for example, calling the suction “Mr Thirsty” or the air-water syringe a “water gun.” This “tell-show-do” approach is a standard part of pediatric dentistry.

If your child is very anxious or very young

For some children, ordinary techniques are not enough. Several options exist for managing anxiety and helping a child sit through treatment safely:

• Nitrous oxide (laughing gas) — a mild sedative breathed through a small mask. The child stays awake and aware but feels relaxed. It wears off within minutes after the mask is removed.
• Oral sedation — a medicine given by mouth before the visit to help the child stay calm. The child is still awake but drowsy.
• General anaesthesia — the child is fully asleep for the procedure. This is usually reserved for very young children, children with extensive treatment needs, children with special healthcare needs, or those who cannot tolerate treatment any other way. It is done in a hospital or accredited day-care setting with an anaesthesia specialist.

The right choice depends on your child’s age, health, and the amount of dental work needed. The dentist will discuss the options and the safety considerations of each one.

What Happens During the Procedure

Step 1: Examination and X-rays

The dentist looks at the tooth and any X-rays already taken. If the cavity is between two teeth, an X-ray is usually needed to see how deep it goes.

Step 2: Numbing the area

For most fillings, local anaesthetic is used so the child does not feel the work. The dentist usually places a numbing gel on the gum first, then gives an injection of local anaesthetic. The numbness develops over a few minutes and lasts one to three hours.

For very shallow cavities, especially in baby teeth, the dentist may not need any anaesthetic at all.

Step 3: Isolating the tooth

The dentist keeps the tooth dry, often using cotton rolls, a suction device, or a small soft sheet called a rubber dam that fits over the tooth. The rubber dam protects the rest of the mouth and helps the filling material bond properly.

Step 4: Removing the decay

The dentist uses a small dental handpiece or a hand instrument to remove the decayed parts of the tooth. Only the damaged tooth structure is removed; healthy tooth is preserved as much as possible.

Step 5: Placing the filling

The cavity is cleaned and prepared. The chosen filling material is placed into the cavity. Composite is added in layers and hardened with a blue light. Glass ionomer is placed and shaped, and sets on its own. The dentist shapes the filling to match the contours of the tooth.

Step 6: Checking the bite

The child bites down on a thin coloured paper that marks any high spots. The dentist trims and polishes the filling so it feels smooth and the bite is comfortable.

For straightforward cavities, the whole procedure is finished in one visit. For multiple cavities, the dentist may split the work across two or more visits, especially for younger children.

Recovery and Aftercare

While the numbness wears off

• The lip, cheek, or tongue on the side of the filling will feel numb and large for one to three hours.
• Children sometimes chew or bite the numb lip without realising and cause a sore. Watch your child during this time and keep them from biting the area.
• It is safer to wait until the numbness has gone before letting your child eat solid food. Cold liquids or soft, lukewarm foods like yoghurt are usually fine.

The first day

• Some children feel mild soreness in the gum where the injection was given. This goes away within a day.
• The filled tooth may be sensitive to cold or pressure for a few days, especially if the cavity was deep.
• Avoid very sticky foods (chewing gum, sticky candy) and very hard foods (ice, hard nuts) on the side of the filling for the first day.
• Brushing can continue as normal that evening, gently around the filled tooth.

When to call the dentist

Contact the dental clinic if your child has:

• Sharp pain when biting that lasts more than a few days — the filling may need a small adjustment
• Persistent throbbing pain, especially at night — this can be a sign that the nerve of the tooth is irritated or infected
• Swelling of the gum or face near the filled tooth
• A filling that feels loose, chips, or comes out
• Fever along with mouth pain

Risks and Complications

Pediatric dental fillings are very safe and the most common complications are mild. It helps to know what to look out for.

Common, usually mild

• Short-term sensitivity to cold or pressure, especially after a deeper filling. This usually settles within days to a couple of weeks.
• Soreness at the injection site, gone within a day.
• A “high” bite if the filling sits slightly too tall — a quick adjustment fixes this.

Less common

• Pulpitis — inflammation of the nerve inside the tooth. This is more likely when the cavity was deep. It may settle on its own or may require further treatment such as a pulpotomy.
• Allergic reaction to a filling material — rare, but possible. Let the dentist know about any known allergies before treatment.
• Recurrent decay around the edges of the filling, often related to oral hygiene and diet.
• Loss or fracture of the filling over time, especially with hard or sticky foods.

Risks related to sedation or general anaesthesia

If your child is having sedation or general anaesthesia, the dental and anaesthesia team will explain the specific risks. These are generally low for healthy children in an appropriate setting, but they are not zero, and informed consent is part of the process.

How Long Fillings Last in Children

The lifespan of a filling depends on the material used, the size and location of the cavity, the child’s oral hygiene, diet, and how heavy the chewing forces are.

• Fillings in baby teeth are often expected to last until the tooth falls out naturally, which may be anywhere from a few months to several years depending on the child’s age and the tooth.
• Fillings in permanent teeth can last many years — often a decade or more — when oral hygiene is good and the diet is not high in sugar.
• Stainless steel crowns on baby molars usually stay in place until the tooth exfoliates.

Regular dental check-ups (typically every six months for most children, more often for those at higher risk) allow the dentist to spot worn or leaking fillings and replace them before a new cavity forms underneath.

Life After the Filling: Preventing New Cavities

Brushing

• Brush twice a day, in the morning and before bed, with a fluoride toothpaste suited to the child’s age.
• For children under three, a smear of toothpaste the size of a grain of rice is generally appropriate. From age three to six, a pea-sized amount is the usual recommendation. The exact amount is something the dentist can confirm based on local guidance.
• Until around age seven or eight, parents should help with brushing — young children do not have the dexterity to clean effectively on their own.
• The last thing in the mouth before bed should be the toothbrush, not a snack or sweet drink.

Flossing

Once two teeth touch each other, the toothbrush cannot clean between them. Daily flossing (or use of floss picks designed for children) helps prevent cavities between teeth, which is where many pediatric cavities form.

Diet

• It is not just the amount of sugar but how often sugar is eaten that drives decay. Frequent sips of juice, fizzy drinks, or sweet milk through the day keep the mouth in an acidic state.
• Try to keep sweets to mealtimes rather than between meals.
• Water is the best drink between meals, especially fluoridated tap water if available.
• Avoid putting a child to bed with a bottle of milk, juice, or formula.

Fluoride and sealants

The dentist may suggest professional fluoride varnish applications at check-ups, especially for children at higher risk. Dental sealants on the chewing surfaces of permanent molars are a well-established way to prevent decay in the grooves of these teeth.

Regular dental visits

Most pediatric dentists suggest a check-up every six months. Children at higher risk of decay may need more frequent visits. Regular visits also help children become comfortable with the dental setting, which makes future treatment easier.

Choosing a Pediatric Dentist

Children do best with a dentist who is comfortable with young patients and who has a clinic set up for them. Things to look for include:

• Training and experience in pediatric dentistry — either a specialist pediatric dentist or a general dentist with significant experience treating children
• A clinic environment that feels welcoming for children, with appropriate behaviour guidance approaches
• Clear explanations of treatment options, including alternatives to drilling where appropriate
• Willingness to let you sit in during treatment, especially for younger children
• A team that listens to your child and to you

It is reasonable to meet a dentist for a first visit before any treatment is planned, so your child can become familiar with the setting.

Frequently Asked Questions

Why does my child need a filling in a baby tooth that will fall out anyway?

Baby teeth typically stay in the mouth for several years and play important roles — chewing, speech, and holding space for the adult teeth that follow. A cavity left untreated can grow, cause pain or infection, and may require the tooth to be removed early, which can affect the alignment of permanent teeth. The decision depends on how soon the tooth is expected to fall out and how deep the cavity is.

Will the filling hurt?

Modern pediatric dentistry focuses on making the visit as comfortable as possible. Numbing gel is used before the injection, the injection is given slowly, and the area is fully numb before any drilling. Most children feel pressure and vibration during the filling but not pain.

Is the X-ray safe for my child?

Dental X-rays use very small amounts of radiation, and modern digital X-rays use even less than older film X-rays. Children are protected with a lead apron and thyroid collar. Dentists order X-rays only when they are needed to make a treatment decision.

Is it true that mercury in silver fillings is harmful?

Dental amalgam contains mercury combined with other metals. Major dental societies have considered amalgam safe for most patients. However, under international agreements aimed at reducing mercury use generally, the use of amalgam in children, pregnant women, and breastfeeding women has been reduced or phased out in many countries. Most pediatric dentists today prefer tooth-coloured materials for children.

What if my child cannot sit still for a filling?

This is common, especially for very young children. Options include splitting the work into shorter visits, using nitrous oxide, using oral sedation, using silver diamine fluoride to slow the decay while waiting for the child to grow older, or, for more extensive needs, treatment under general anaesthesia. The dentist will discuss what fits your child’s situation.

How soon can my child eat after a filling?

If a tooth-coloured filling was placed and hardened with a blue light, the filling itself is set immediately. The main reason to wait is the numbness from the anaesthetic, which lasts one to three hours. Eating while numb risks an accidental bite of the lip or cheek. Soft, cool foods after the numbness wears off are a good start.

My child’s tooth is still sensitive a week after the filling. Is that normal?

Some sensitivity to cold for a week or two is common, especially after a deeper filling. If the tooth hurts when biting, the filling may sit a little too high and needs a small adjustment. If pain is severe, throbbing, or wakes the child at night, this can mean the nerve is irritated and the dental clinic should be called.

Can a filling be done without drilling?

In some cases, yes. Silver diamine fluoride can stop decay without drilling. The Hall technique can place a crown over a decayed baby molar without drilling. Very early decay can sometimes be reversed with fluoride. These options depend on the size and stage of the cavity and on the child.

How can I tell if my child has another cavity forming?

Many cavities, especially between teeth, cannot be seen without an X-ray. Signs that may suggest a new cavity include a dark or chalky spot on a tooth, a complaint of sensitivity to cold or sweet foods, a tooth that hurts when chewing, or a bad smell from one area of the mouth. Regular dental check-ups are the most reliable way to catch new cavities early.

Are tooth-coloured fillings as strong as silver fillings?

Modern composite resin fillings perform very well in children when placed carefully on a dry tooth. For very large cavities on baby back teeth, a stainless steel crown is often more durable than any filling. The dentist chooses the option that is most likely to last for the life of the tooth.

Conclusion

Dental fillings are a routine and effective part of caring for children’s teeth. They stop decay, take away pain, and let baby and permanent teeth keep doing the work they are meant to do. The materials, techniques, and behaviour guidance approaches used in pediatric dentistry today are designed to make the experience gentle and to set children up for a positive relationship with dental care.

The most important thing parents can do, beyond getting cavities treated early, is to support daily prevention — helping with brushing, watching the diet, attending regular check-ups, and asking the dentist about preventive options such as fluoride varnish and sealants. With early treatment when needed and steady prevention at home, most children grow up with healthy teeth and the confidence to take care of them.