Written & medically reviewed by Dr. Sanjay Anbu, MBBS· Last reviewed
Most mouth ulcers are harmless and heal within 1–2 weeks. Soothing gels and rinses ease the pain while they heal — but an ulcer that lasts more than 3 weeks needs to be checked.
Vitamin correction if deficient (iron, B12, folate)
Doctor/dentist-guided
Steroid mouth gels/rinses for severe or recurrent ulcers
Investigating recurrent ulcers
When to see a doctor urgently
An ulcer lasting more than 3 weeks (needs to be checked, especially in tobacco users)
Frequent, severe or widespread ulcers
Ulcers with weight loss, or a neck lump
Not a prescription. This lists medicines commonly used for this condition to help you understand your options — it is NOT a prescription. Do not self-medicate: the right choice and dose depend on the cause, your health and other medicines, and prescription drugs (especially antibiotics) need a doctor. Misusing antibiotics drives resistance.
Frequently asked questions
What is the best medicine for mouth ulcers?
Numbing gels and antiseptic or salt-water rinses ease pain and aid healing. Recurrent or severe ulcers may need a steroid gel, and deficiencies should be corrected.
Why do I keep getting mouth ulcers?
Common causes are minor injury, stress, certain foods, and deficiencies of iron, B12 or folate. Recurrent ulcers are worth investigating.
When is a mouth ulcer serious?
An ulcer that does not heal within 3 weeks — especially in tobacco or alcohol users, or with a neck lump or weight loss — must be checked to rule out oral cancer.
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.