Anyone whose ever been to a bad dentist would see the merit in this. I used to go to a "budget" dentist when I was a kid and had very painful experiences, it can be excruciatingly painful if the dentist doesn't know what he's doing.. or doesn't care.

This is not a point that transfers 1:1 to a hair stylist.. the odds and consequence of a stylist cutting me vs a dentist tapping a nerve is.. huge.