Burning on the tongue after dental treatment can be due to irritation, minor nerve sensitivity, or a reaction to dental materials. Rinse with lukewarm saltwater, avoid spicy and hot foods, stay well hydrated, and keep your mouth clean to help with healing. You can also choose soft, bland foods for a few days to reduce discomfort. If the burning does not settle or worsens, consult a doctor or dentist to determine the cause and receive proper care.

Recurrent mouth ulcers for several years can be frustrating and uncomfortable, especially when they keep returning despite treatment. Mouth ulcers may occur due to stress, lack of sleep, acidity, vitamin deficiencies such as low vitamin B12, iron, or folic acid, food sensitivities, sharp teeth, poor oral hygiene, or sometimes underlying medical conditions. Medicines like Lexanox and Smile gel can help reduce pain and speed healing during an active ulcer, but they may not prevent the ulcers from coming back if the root cause is not identified. Try to avoid spicy, very hot, or acidic foods, maintain good hydration, use a soft toothbrush, and avoid tobacco or smoking if applicable. Eating a balanced diet rich in fruits, vegetables, and vitamins may also help. Since your ulcers have been recurring for the past 3 years, it would be a good idea to undergo a proper medical evaluation to look for possible nutritional deficiencies, acidity issues, allergies, or other health conditions. You can initially consult a general physician, who may advise blood tests and a basic evaluation. An ENT specialist or an oral medicine/dental specialist can also examine the mouth carefully if the ulcers are severe, very frequent, large, or not healing properly. If you notice weight loss, fever, difficulty swallowing, bleeding, or ulcers lasting more than 2 weeks continuously, you should seek medical attention promptly.