<s>[INST] My tongue is sore on the sides, as well as, the inside of my cheeks. I keep biting them because they are swollen.  Could I be allergic to something or did I just irritate my mouth by biting it and the swelling makes me keep biting it? What should I do? [/INST] Hello and welcome. Biting or chewing on tongue is not healthy habit. You can meet your dentist. Get the sharp edges of the teeth ground, if required. Also start with vitamin B complex for a week and see if it helps. If the symptoms subside then it is fine else a small biopsy will be required to see the type of lesion. Remember continuous irritation to tongue can be very harmful., so please avoid that. Maintain good oral hygiene and do warm saline rinses. Hope it helps. Thanks. Take care. </s>