3 of my back teeth (top & bottom) are crumbling. One upper left far back tooth has ony 1 side left and it is held by the filling, the rest of the tooth is gone and there is a hole there.Can a dentist pull this or will I need an oral surgen? What will happen if the last piece falls off? 2 other teeth are breaking off also. All of my bottom teeth have cavities at the bottom near the gum line. I am 61 years old and have no insurance.What do you reccomend? How much will I expect to pay?