There are a number of steps that can be taken if your teeth are sensitive. Initially, you can buy yourself a toothpaste that guards against sensitivity and helps you with sensitivity. There are also mouthwashes that are for sensitive teeth.
But really, the solution to the problem would be to go visit your dentist because your dentist can isolate the problems that are possibly happening in your mouth like root recession; they can fix that for you. You can’t do that on your own.
Seeking the advice of a professional would be the best thing to do. Your dentist is able to give you a regimen of different materials to use at home to help your situation.