Most common mouth ulcers heal within 7 to 14 days. If an ulcer remains for more than two weeks, repeatedly returns, bleeds, grows larger, or develops hard edges, consult a specialist. A non-healing ulcer may be among the early signs and symptoms of oral cancer, especially when accompanied by red or white patches, numbness, swelling, or difficulty chewing. Other signs and symptoms of oral cancer and early signs and symptoms of mouth cancer may include unexplained bleeding, a mouth lump, or persistent pain. The signs and symptoms of mouth and throat cancer can also include difficulty swallowing, hoarseness, ear pain, or a neck lump. Dr Smit A. Desai provides careful evaluation of persistent mouth ulcers and recommends appropriate tests when required. Conclusion Get any mouth ulcer lasting beyond two weeks checked promptly. Most ulcers are harmless, but early examination helps rule out serious conditions and ensures timely treatment.