I recently had some dental work done. I was so afraid of getting in the chair and having a panic attack and not being able to get out. Well, before they even were able to look in my mouth I told them that I had anxiety issues and that I get very nervous. The dentist told me that he was glad I told him that, and if at any time I needed to stop just raise my finger and he would let me rest. That reassured me and I was able to calm down. Just in case it didn't work, I did take a xanax about an hour before the procedure. And just like I thought, I started getting very uneasy during a filling. I did ask for him to stop, got up, went to the bathroom, then came back. Just knowing that you can stop anytime you want, and are able to get up was so reassuring to me. Now I don't think it's that big of a deal. I think by not telling the dentist you will create more anxiety for yourself. Take some of the pressure off and let him know you need breaks.. I'm sure if he's any type of professional at all he will understand. I hope this helps.