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.