Just got done about 30 minutes ago. Everything seems fine. No problems while procedure was being done. Hopefully no zingers at all.
I have been using Colgate sensitive for a few weeks and occasional fluoride rinse. Also took two Aleve right before I sat down in chair for them to start prepping me.
Results are good and will get better when I pick up my trays and home solution on Tuesday.
I would certainly recommend this at my dentist's office!!