Underbite surgery can correct a significant skeletal imbalance between the upper and lower jaws, but recovery happens gradually rather than all at once. You may feel substantially better within a few weeks, while swelling, numbness, dietary restrictions, bone healing, and orthodontic refinement can continue for several months.
For this reason, there is no single number that represents the entire recovery period. The timeline depends on whether surgery involves the lower jaw alone or both jaws, the extent of the correction, your general health, and how your body heals. Underbite surgery is a form of orthognathic surgery. You can learn more about the broader treatment approach on our jaw surgery page.
A Typical Recovery Timeline
While every recovery is individual, the following timeline gives a practical idea of how different stages may progress after corrective surgery for a skeletal underbite.
First few days: swelling, tightness and limited mouth opening
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
The first several days are usually the most demanding part of recovery. After surgery, the face can become noticeably swollen and feel tight. Jaw stiffness, difficulty opening the mouth widely, fatigue, and changes in speech or swallowing are also common during this early period.
Swelling is generally greatest around the second or third day before gradually beginning to decrease. Pain or discomfort is often most noticeable during the first few days and usually continues to improve over the following couple of weeks.
Eating is also different at this stage. You may initially manage liquids before progressing to soft foods according to your surgical team's instructions.
End of the first week: beginning to feel more comfortable
By the end of the first week, many patients are beginning to feel more comfortable, although substantial swelling may still be present. You may still have:
- Facial swelling and bruising
- Jaw stiffness
- Limited mouth opening
- Altered sensation or numbness
- Fatigue
- A predominantly liquid or soft diet
Weeks 2–3: swelling starts to settle
During the second and third weeks, the most obvious swelling generally begins to settle significantly. Some patients can return to less physically demanding work, study, or other daily activities during this period, depending on how they feel and the nature of their work.
However, recovery is still underway. The jaw may remain stiff, and altered sensation—particularly after lower-jaw surgery—can persist.
Discomfort usually becomes considerably less noticeable than it was immediately after surgery. Research examining short-term quality of life after orthognathic surgery found that pain and medication use commonly persisted for around 2–3 weeks, although individual recovery varied.
Weeks 4–6: progressing with eating and daily activities
By approximately four to six weeks, many patients have progressed beyond the earliest dietary restrictions and can gradually move toward a more normal diet when their surgical team considers it appropriate.
Some specialist patient guidance recommends liquids initially, followed by a soft diet for several weeks, with a gradual return toward normal foods after around four to six weeks.
This does not mean that the jaw is completely healed. It means that recovery has progressed enough for eating and everyday activities to become considerably easier for many patients.
Weeks 6–8: functional recovery becomes more noticeable
By six to eight weeks, many of the everyday effects of surgery have improved substantially. Jaw movement, eating, speaking, and general comfort generally become easier as recovery progresses.
A prospective study of postoperative quality of life found that problems involving oral function took the longest to resolve, with approximately 6–8 weeks required for most patients to experience resolution of these issues. At this stage, however, subtle swelling or altered sensation may still remain.
Three months: continued healing and orthodontic refinement
At around three months, many patients are well beyond the early recovery phase, but the treatment process may not yet be finished.
Residual swelling can continue to decrease, facial tissues continue adapting to the new jaw position, and sensation may continue to improve.
Orthodontic treatment may also continue during this period. Braces or other appliances can be adjusted to refine the relationship between the teeth after the jaws have been repositioned.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Importantly, a person can feel relatively normal while the underlying bone and surrounding tissues are still undergoing healing and remodeling.
Three to six months and beyond: later recovery
Recovery continues beyond the point at which you return to everyday activities. Subtle facial swelling can take several months to disappear completely, and altered sensation may continue to improve over an extended period. Bone healing and remodeling also continue after the initial recovery phase.
What Takes the Longest to Recover?
Different aspects of recovery move at different speeds.
| Part of recovery | Typical pattern |
|---|---|
| Pain and discomfort | Usually most noticeable in the first few days and improves substantially over the following weeks |
| Major facial swelling | Usually begins decreasing after the first few days; most obvious swelling often settles within about two weeks |
| Diet | Liquids initially, followed by soft foods and gradual progression toward normal eating |
| Everyday activities | Often resume progressively over the first few weeks depending on recovery and activity demands |
| Oral function | May take around 6–8 weeks or longer to return toward normal |
| Residual facial swelling | Can continue to improve for several months |
| Numbness or altered sensation | May improve gradually over weeks or months; recovery varies between individuals |
| Orthodontic refinement | May continue after surgery as the final bite is established |
When Can You Eat Normally After Underbite Surgery?
Eating normally usually takes longer than simply returning to work or going out socially. Immediately after surgery, liquids are generally easier to manage. As healing progresses, patients are commonly moved to a soft diet before gradually reintroducing firmer foods.
Some specialist postoperative guidance recommends a liquid diet during approximately the first week, followed by soft foods for several weeks and gradual progression toward normal food around four to six weeks.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
The exact timing is important because chewing hard or excessively firm foods before the jaw has sufficiently healed can place unnecessary stress on the surgical areas. Always follow the specific dietary instructions provided by your surgical team.
How Long Does Numbness Last?
Numbness or altered sensation is one of the symptoms that can last longer than pain and swelling. Lower-jaw surgery can affect sensation around areas such as the lower lip and chin because important nerves run through the jaw. Sensation often improves gradually, but the speed and extent of recovery vary.
Recent systematic evidence across orthognathic surgery found that neurosensory disturbances were relatively common after surgery, with most patients experiencing recovery during follow-up, although a smaller proportion had persistent sensory changes.
For this reason, numbness should be considered part of the longer recovery process rather than something that necessarily disappears within the first few weeks.
What Happens to the Bite During Recovery?
Your bite may feel different immediately after surgery because the jaws have been deliberately repositioned. The teeth and surrounding muscles also need time to adapt to the new jaw relationship.
Orthodontic treatment commonly continues after surgery to refine the tooth positions and establish the final occlusion. Changes in occlusion after orthognathic surgery are well documented, which is why postoperative orthodontic follow-up is an important part of the overall treatment process.
If your bite feels slightly different during early healing, this does not automatically mean that something has gone wrong. Your surgical and orthodontic teams monitor the developing bite during follow-up.
The Bottom Line
Recovery from underbite surgery is best understood as a series of stages rather than a single recovery date. The first few days are dominated by swelling, stiffness, and dietary restrictions. Over the next two to three weeks, discomfort and major swelling generally improve, while everyday activities gradually become easier.
By around six to eight weeks, many patients have made substantial progress with oral function and eating, although recovery is still continuing. Subtle facial swelling, altered sensation, bone healing, and orthodontic refinement can take several additional months.
The exact timeline depends on whether you have lower-jaw surgery alone or double jaw surgery, the extent of the correction, your general health, and how your body heals. Your surgical team's individual recovery plan remains the most reliable guide for your specific situation.
