Hi, Younggranny . . . it had been years since I had been to the dentist and found out my wisdom teeth and the teeth next to them all had to come out. I was terrified! I had never had teeth pulled before.
They prescribed me two Diazepam (I think that is like Xanax), one to take before I left for the appointment and one to take after I got in the chair before they gave me the Lidocaine numbing shots.
I did not have any interference because of the two together. Call your dentist office and ask to be sure but they do have alternatives if Xanax is not the same as what I had.
The result was that the appointment went very smoothly, I did not notice the time in the chair, and after I got home and could take the gauze out, I slept until after 8:00 on the couch that night.