After Your Oral Biopsy
What to expect after a mouth biopsy. How to care for the wound and ease pain, when to contact your dental team, and when you will get your results.
Urgent help: who to contact
Call 999 or go to A&E now if you find it hard to breathe, swallow or speak, or if swelling spreads to your neck, under your tongue or around your eye.
Contact your dental team if bleeding does not stop after 30 minutes of firm pressure, or if you get a lot of swelling, a high temperature above 38°C, or signs of wound infection. If you cannot reach them, call NHS 111.
What Has Just Happened
In a biopsy, a small piece of tissue is taken from your mouth. It is sent to a laboratory (a pathology department). There, specialists look at the cells under a microscope. This gives an accurate diagnosis.
Biopsies are done for many reasons. The most common are to check an unusual patch or ulcer, to confirm a diagnosis, or to rule out something more serious. Having a biopsy does not by itself mean that something serious is wrong. It is the most reliable way to get an accurate answer.
- You had a numbing injection (local anaesthetic) for the biopsy. It will wear off within 2–4 hours.
- A small wound is left where the tissue was taken. You may have stitches. These usually dissolve.
- Some soreness, a little bleeding and some swelling are normal.
Caring for the Biopsy Site
Looking after the wound well helps it heal. It also lowers the risk of infection.
- Do not have very hot food or drinks until the numbness has worn off.
- Do not rinse hard on the day of the biopsy. This can loosen the blood clot and start the bleeding again.
- From day 2, rinse gently with warm salty water after meals. Use half a teaspoon of salt in a glass of warm water. Do this for 5–7 days.
- Eat soft foods while the area heals. Avoid hard, sharp, crunchy or spicy foods. They could irritate the wound.
- Brush your other teeth as normal. Keep away from the biopsy site for the first few days.
- A white layer may form on the wound as it heals. This is normal healing tissue (fibrin), not infection. Do not try to remove it.
- The area usually heals fully within 2–4 weeks. This depends on its size and where it is.
Managing Pain After Your Biopsy
Pain after a mouth biopsy is usually mild to moderate. It settles within a few days.
- Paracetamol (adults): take 500mg to 1g (1 or 2 × 500mg tablets). Leave at least 4 hours between doses. Do not take more than 4g (8 × 500mg tablets) in 24 hours. If you weigh less than 50kg, you may need a lower dose. Ask a pharmacist.
- Ibuprofen (adults): take 200mg to 400mg up to 3 times a day, with or after food. Leave at least 4 hours between doses. Do not take more than 1,200mg in 24 hours, unless your dentist or doctor has prescribed a different dose.
- You can take paracetamol and ibuprofen at the same time, or spread them out through the day. Never take more than the daily maximum of either.
- Do not take paracetamol with other medicines that contain paracetamol, unless your dental team or doctor has told you to. These include co-codamol, co-dydramol and cold and flu remedies. Taking both can cause an accidental overdose.
- Check with a pharmacist, dentist or doctor before you take ibuprofen if you have asthma, have had a stomach ulcer, have heart, kidney or liver problems, take blood-thinning medicines, or are pregnant.
- Children: use children's paracetamol or ibuprofen. Give the dose on the packet or leaflet for your child's age (and weight, if given). Ask a pharmacist if you are not sure. Ibuprofen may not be suitable if your child has asthma.
- Take pain relief before the numbness wears off.
- Do not take aspirin for pain. It thins the blood and may make you bleed more. If your doctor has prescribed a daily low-dose aspirin or any other blood thinner, do not stop it. Keep taking it as normal unless your doctor or dentist tells you otherwise.
- If your pain is getting worse after day 3 instead of better, ask your dental team to check it.
Your Results — When and How You Will Hear
Waiting for biopsy results can be worrying. Knowing what to expect may help.
- Results usually take 10–14 working days from when the sample reaches the laboratory. This can vary.
- Your dental team will contact you to talk about the results. This may be by phone or at a follow-up visit.
- If you have not heard by then, it is fine to contact the practice and ask for an update.
- The vast majority of mouth biopsies show nothing serious (a benign result).
- Whatever the result, your dental team will explain what it means. If you need more treatment or a referral, they will guide you through the next steps.
Please contact the practice if you have questions or worries while you wait for your results. Your dental team is there to help.
When to Contact Your Dental Team
Contact your dental practice if you notice:
- Bleeding from the biopsy site that does not stop after 30 minutes of firm pressure with a clean cloth
- Swelling that is getting bigger, not smaller, after day 3
- Signs of infection: pain that is getting worse, pus or yellow fluid, or a bad smell from the site
- A temperature above 38°C
- Stitches that come out very early (contact the practice for advice)
- Anything else about the wound that worries you
Call 999 or go to A&E now if you find it hard to breathe, swallow or speak, or if swelling spreads to your neck, under your tongue or around your eye. For other urgent problems, contact your dental practice. If it is closed, call NHS 111.
This leaflet is for general information only and does not replace professional dental advice. Your dental team will discuss your individual circumstances and any risks specific to you. Treatment outcomes vary between patients depending on individual circumstances.
Sources
- Suspected cancer: recognition and referral (NG12). National Institute for Health and Care Excellence (NICE), 2015, updated April 2026.
- Symptoms of mouth cancer. NHS website (nhs.uk), reviewed June 2023.
- Drug Prescribing for Dentistry, 3rd edition; online version updated for BNF 91. Scottish Dental Clinical Effectiveness Programme (SDCEP), 2016, updated 2026.
- Management of Dental Patients Taking Anticoagulants or Antiplatelet Drugs, 2nd edition. Scottish Dental Clinical Effectiveness Programme (SDCEP), 2022.
Links checked 18 October 2026.
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