When i close my teeth togther i can feel some extra flesh between them and it hurts.is this some infection?it could be a cut from supari i ate.

Wisdom teeth ?: If this "extra flesh" is near the most posterior teeth, you might be cheek biting or there may be tissue overlying the last lower molar. Most people don't have enough room in their mouths for their wisdom teeth... that's why they are extracted so often. This may be the case for you. See a local dentist to find out.

See a dentist : This infection will not resolve on its own with home care. There are many and various dental problems with symptoms you have described (e.g. operculum, hyperplasia, etc.). I can appreciate your concerned about your dental health, but finding a proper diagnosis and treatment may be the answer to your worries. Rec.: see a dentist for evaluation, imaging and treatment. Take good care.