My MIL doesn't have fibro but does has extremely sensitive teeth. She went to one dentist who used a baking soda spray instead of scraping (kind of like sand blasting). She moved and could only find "scrapers" in her new town, but she has them use Orajel on her gums before they start, and that seems to help.
Hugs - Austen
"There is no charm equal to tenderness of heart." - Jane Austen