Refused dental treatment

I'm unable to get in to see my dentist because I'm exempt from wearing a mask. The dentist office will not honor exemptions at all. I even called ahead of time to see if there was something we could work out but they said there's no exceptions. I find this super ridiculous considering its the DENTIST, so once I'm in the chair he will have his hands in my mouth and I won't have the mask on. This is absolutely insane! So I'm refused treatment just because I can't wear a mask for 2 minutes in the waiting room? I have half a tooth missing and am going to end up in the hospital soon if I don't get help. Wearing a mask for 2 minutes is not even an option for me. I'm exempt due to ptsd reasons and even putting the mask on for 3 seconds will be very triggering. Ugh…