If you have pain while chewing the food then that means either the tooth is infected or you have some gum infection. For this you have to visit a dentist, who will do the clinical examination and take the xrays and find out the cause of pain. Without seeing the case clinically, it is difficult to give diagnosis. If the cause is the tooth infection then may be you have to go for root canal treatment and if it is due to gum infection then some gum treatment will be recommended. For more info you can read this article... http://www.identalhub.com/article_home-remedies-for-dental-problems-88.aspx