In short. The incision sits among the mouth own bacteria. Why decay and gum disease are treated first, and how to keep the mouth clean around a healing incision.
Key points
- Brushing continues, carefully, with the brush kept away from the incision line itself in the first days.
- Rinsing is done as instructed by the team rather than with whatever is in the bathroom cabinet, and alcohol-based rinses are avoided because they irritate healing lining.
- Smoking is the single most damaging thing for healing in the mouth as well as in bone.
An angle reduction is performed through an incision in the lining of the mouth, which means the operative field is the same place the mouth own bacteria live. That is the reason dental and gum health are part of the preparation for an operation that has nothing to do with the teeth, and it is also the reason mouth hygiene matters more than usual in the weeks afterwards.
Why the mouth is assessed first
An infection that begins in the mouth can reach the bone that was operated on, and an infection in bone is a serious problem to treat. Active decay, an infected tooth and untreated gum disease are all sources of bacteria sitting in the field. Where any of those is found, treating them first is the plan rather than proceeding and hoping, and the operation is dated around that treatment. The interval this creates also allows treated gums to settle before they have to heal alongside a cut in the bone.
Keeping the mouth clean around a healing incision
Brushing continues, carefully, with the brush kept away from the incision line itself in the first days. Rinsing is done as instructed by the team rather than with whatever is in the bathroom cabinet, and alcohol-based rinses are avoided because they irritate healing lining. Smoking is the single most damaging thing for healing in the mouth as well as in bone. Food that leaves debris around the incision is worth avoiding while it heals.
What the patient is asked about
The date of the last dental examination, any treatment that is outstanding, any tooth that has been painful, whether the gums bleed when brushing, and whether there are crowns, bridges or implants near the back of the lower jaw. A tooth sitting close to the line of the incision is identified beforehand, so that it can be protected rather than discovered. A dental examination is part of the workup for this operation, not an optional extra.
What infection looks like afterwards
Pain and swelling in the mouth are expected in the first week and then improve. Infection is what happens when they get worse instead: increasing pain after the first week, swelling that grows, discharge or a bad taste from the incision, a fever, or a wound that opens. Any of those is a reason to contact the team rather than to wait for a scheduled appointment.
Signs to report rather than wait out
- Pain or swelling in the mouth that is increasing after the first week rather than settling.
- Discharge, a bad taste or a foul smell from the incision, or a wound that is opening.
- Fever, or feeling generally unwell with a swollen and tender jaw.
The mouth is the route the operation takes and the place it heals in. Treating the teeth and the gums as part of the preparation is not a formality, and keeping the mouth clean afterwards is one of the few parts of the recovery the patient fully controls.
Frequently asked questions
Why do I need a dental examination before jaw surgery?
Because the incision is inside the mouth, which is where the mouth own bacteria live. Decay, an infected tooth and untreated gum disease are all sources of bacteria sitting in the operative field, and an infection that reaches the bone that was operated on is a serious problem to treat. The examination is part of the workup for this operation rather than an optional extra.
How do I brush my teeth after an operation inside my mouth?
Brushing continues, carefully, with the brush kept away from the incision line itself in the first days. Rinsing is done as the team instructs rather than with whatever is in the cupboard, and alcohol-based rinses are avoided because they irritate healing lining. Smoking is the single most damaging thing for healing in the mouth as well as in bone, and it is worth stopping well before the operation rather than after it.
Could a tooth near the incision cause a problem afterwards?
It is identified before the operation precisely so that it does not become a surprise afterwards. A tooth sitting close to the line of the incision is noted, protected during the operation, and checked afterwards, and any treatment it needs is planned around the healing rather than through it. Finding it during the operation instead is a worse position for everybody.
Risks & Limitations
- The change is permanent and the amount removed is treated as fixed. Bone that has been taken away cannot be put back, and material added later does not behave like the mandible it replaces.
- The canal carrying the nerve to the chin runs inside the bone being cut. Numbness of the chin and lower lip is expected rather than rare, usually improves over months, and may not return fully.
- The nerve that moves the lower lip runs near the outer surface of the bone. Weakness after surgery is usually temporary and usually resolves; a lasting weakness is uncommon but possible.
- The vessels supplying the face run close to the surface of the angle. Bleeding afterwards is the complication this operation most wants to avoid, because a collection of blood in the floor of the mouth can compromise the airway.
- The masseter is detached from the bone it was attached to and reattaches. Width can partly return if the muscle thickens again, which is not the bone growing back.
- Swelling hides the result for months. The face reads wider than expected at two weeks, unevenly at three months, and the result is judged honestly at around a year.
When to Seek Care
- Difficulty breathing, a feeling of pressure or swelling in the floor of the mouth, or difficulty swallowing. Seek emergency care at once.
- Swelling that is increasing rather than settling after the first week, or that is much greater on one side. Contact the team.
- Weakness of the lower lip that appears after the first week, or that is worsening rather than improving.
- Numbness that is spreading rather than staying stable, or a wound in the mouth that is opening or discharging.
- Fever, or feeling generally unwell with a swollen and tender jaw. Calf pain or swelling in one leg, or chest pain and shortness of breath, need emergency care at once.
References & Further Reading
- American Society of Plastic Surgeons (ASPS) — procedure and safety guidance
- National Institute for Health and Care Excellence (NICE, UK) — relevant guidance
- Cochrane Library — systematic reviews
- Chinese Medical Association Plastic Surgery Branch — clinical guidance
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.