I have an exposed nerve on one of my back teeth and do not have any insurance is there anything i can do at home to nake it stop hurting?

No: Find out if you have a local dental school that will take you as a patient at a reduced fee. You might have to wait but the cost is a fraction of what local dentists charge.

Sensodyne: You can try to brush with something like sensodyne. However, if this is a sign of deteriorating dentition, you really should see a dentist, as these problems can get out of hand and lead to infection.