I had a cavity filled last year and the dentist told me about how when he was a child, he went to a dentist who didn't use local anesthetics and he felt everyth

I had a cavity filled last year and the dentist told me about how when he was a child, he went to a dentist who didn't use local anesthetics and he felt everything. He didn't say it but I suspect that he went into dentistry to save other people from what he experienced.