I am sorry to hear you are having such problems with your teeth, i suffer from very sensitive teeth, and use a sensodyne toothpaste recommended by my dentist, it does help.

Do you guys go to a dentist that offers waterlaser treatment,? its supposed to be painless, no drills, injections, and they can do amost anything that way, I am changing to a new dentist because he offers this service, BTW he learn't the procedure in the good ole US of A, no suprises there, actually I am going next sat, but just for a clean and polish, hope thats all anyhow.