An oral biopsy involves removing a small sample of tissue from the mouth. This sample is sent to a laboratory (a pathology department) where specialists examine the cells under a microscope to provide an accurate diagnosis.
Biopsies are done for many reasons — most commonly to investigate an unusual patch or ulcer, to confirm a diagnosis, or to rule out something more serious. Having a biopsy does not automatically mean that something sinister is wrong. It is the most reliable way to get an accurate answer.
You will have had a local anaesthetic for the procedure. This will wear off within 2–4 hours.
A small wound is left at the biopsy site. Stitches may have been placed — these are usually dissolvable.
Some soreness, minor bleeding, and swelling are completely normal.
Caring for the Biopsy Site
Looking after the wound well helps healing and reduces the risk of infection.
Avoid eating or drinking very hot food or drink until the anaesthetic has worn off.
Do not rinse vigorously on the day of the biopsy — this can dislodge the clot and restart bleeding.
From day 2, rinse gently with warm salty water after meals (half a teaspoon of salt in a glass of warm water) for 5–7 days.
Eat soft foods while the site heals — avoid hard, sharp, crunchy, or spicy foods that could irritate the wound.
Brush your other teeth normally, but avoid the biopsy site for the first few days.
The wound may develop a white coating as it heals — this is normal fibrin and not infection. Do not try to remove it.
The site will usually heal fully within 2–4 weeks depending on its size and location.
Managing Pain After Biopsy
Pain after an oral biopsy is usually mild to moderate and settles within a few days.
Take paracetamol 1g up to four times daily and/or ibuprofen 400mg up to three times daily with food (if suitable for you) to manage discomfort.
Start pain relief before the anaesthetic wears off.
Avoid aspirin — it can increase bleeding.
Pain that is worsening after day 3, rather than improving, should be reviewed by your dentist.
Your Results — When and How You Will Hear
Waiting for biopsy results can feel anxious. Knowing what to expect may help.
Results typically take 10–14 working days from when the sample reaches the laboratory, though this can vary.
Your dentist will contact you to discuss the results — either by phone or at a follow-up appointment.
If you have not heard within the expected timeframe, it is completely appropriate to contact the practice to ask for an update.
The vast majority of oral biopsies return benign (non-serious) results.
Whatever the result, your dentist will explain what it means and, if any further treatment or referral is needed, will guide you through the next steps.
Please do not hesitate to contact the practice if you have questions or concerns while waiting for your results — we are here to help.
When to Contact Your Dentist
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 increasing rather than decreasing after day 3
Signs of infection: increasing pain, pus or yellow discharge, an unpleasant odour 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 concerns you
For out-of-hours advice, call NHS 111. Go to A&E if you have difficulty breathing or swallowing.
This leaflet is for general information only and does not replace professional dental advice. Your dentist will discuss your individual circumstances and any risks specific to you. Treatment outcomes vary between patients depending on individual circumstances.
When to Seek Urgent Help
Contact your dentist if bleeding does not stop after 30 minutes of firm pressure, you develop significant swelling, a high temperature above 38°C, or signs of wound infection. Call NHS 111 outside working hours if you cannot reach your practice.
References
Aligned with guidance from: SDCEP, FGDP(UK), NICE guidelines on oral cancer recognition.