HI Bex, i understand where your coming from, everytime i go into a dentist i get horrific symptoms , i know for sure because i have been for 15 minute checkups recently in a mercury free dentist and feel terrible afterwards and it lasts weeks. We must be so sensitive to mercury because we are severly poisoned. I am overdue for another checkup for a cavitation but i cant go, i dont know when i will ever be able to have this checked out. take care, dawn.