Toothache on applying pressure on that tooth.also the tooth has become sensitive to hot and cold foods.how do i get rid of the pain and sensitivity?

THE NERVE IN YOUR TOOTH IS INFECTED DUE TO A LARGE CAVITY OR TRAUMA TO THE TOOTH. IF YOU WANT TO SAVE THE TOOTH THAN YOU NEED A ROOTCANAL OR AN EXTRACTION. SEE YOUR DENTIST NOW TO SEE IF YOUR TOOTH CAN BE SAVED WITHOUT THE PREVIOUS METHODS.

Only one way. Pills, potions, salves, rinses, will not work. It sounds as if you have infected tooth/teeth. You must see a Dentist immediately as toothache usually means infection. Seek quality, not bargain, treatment.

You'll need to see a dentist to have the tooth examined and restored. You alone cannot resolve the issue.