Please visit for consultation as the underline cause should be treated. Teeth are meant for chewing so please get this sorted and use both the sides for eating.

I think there might be a carious lesion of the teeth.. Pls see a dentist.. For further treatment.. Donot stop chewing by ur self until recommended as it might cause worst scenarios in future

Gum and tooth pain are two separate problems and sometimes might be inter related. So you need to get proper diagnosis done so that it can be ruled out as to where the exact problem lies. always remember, prevention is better than cure. So kindly visit a dentist. Pain while brushing indicates gum issues while chewing indicates that it is tooth related. So get it properly diagnosed.