First Aid for Cuts Inside the Mouth
December 03 2025
3 min reading time
Cuts inside the mouth are common and can happen while eating, during sports, after a fall, or from biting the cheek or lip by accident. Mouth injuries often look dramatic due to the presence of saliva, but many settle with simple first aid steps.
This guide explains how these injuries happen, what signs to look out for and simple first aid steps to help provide comfort while you monitor the area.
For external minor wounds, see our minor cuts first aid guide .
Common Causes of Oral Cuts
Cause
How It Happens
Typical Area
Biting the cheek or lip While eating, talking or chewing.
Inner cheek, lip lining.
Falls or bumps Playground accidents, sports, slips.
Inner lips, gums.
Sharp foods Hard crisps, crusty bread, sharp edges.
Tongue, gums.
Braces or dental appliances Friction against the mouth lining.
Cheeks, inner lips.
Common Signs of a Minor Mouth Cut
Mild bleeding (often mixes with saliva)
Tenderness in the area
Swelling on the lip, cheek or gum
Small visible cut or graze
Sensitivity while eating
First Aid Steps for Cuts Inside the Mouth
Rinse the mouth gently with clean water.
Apply gentle pressure with a clean cloth or gauze pad if there is mild bleeding.
Encourage the person to sit upright and avoid lying flat.
Use something cool (like a cold drink or wrapped cold pack held externally) to help soothe the area.
Avoid touching the cut with fingers.
Encourage soft foods until the area feels better.
For children, see our baby & child first aid guide .
When Further Advice May Be Needed
Further advice may be required if:
Bleeding lasts longer than a short period
The cut is large or deep
There is increasing discomfort
The person has difficulty responding normally
The injury was caused by a significant impact
Useful First Aid Kit Items for Mouth Cuts
Soft gauze pads
Gloves
Cleansing wipes (for the outside of the lips)
Cold packs
Waste bag for used wipes
To restock your kit, see our refills guide or browse our full range of UK first aid kits .
How to Reduce the Risk of Future Mouth Cuts
Take care when eating hard or sharp foods
Encourage children to slow down while eating
Wear suitable mouth protection in contact sports
Keep walkways clear to reduce slips and falls
Ask orthodontists about wax for braces rubbing
Cuts Inside the Mouth — FAQ
Is it normal for mouth cuts to bleed more?
Cuts inside the mouth can appear to bleed more because saliva mixes with the area.
Can I apply something directly to the cut?
Rinsing and letting the area rest is usually most helpful.
Should I use a cold pack inside the mouth?
Use cool drinks or hold a cold pack gently on the outside of the cheek.
Can children eat normally afterwards?
Soft foods may be more comfortable for a short period.
Do mouth cuts take long to settle?
Minor mouth cuts can settle over a short period of time.
