Bad dentists do operate. Guess how we deal with that? Take away the license.<p>And as others have pointed out, it&#x27;s more than a bad haircut at stake. Especially if you&#x27;re a female -- some jackass wielding some dye or chemical can damage your hair or scalp permanently.<p>It&#x27;s easy to criticize this stuff when you live in a society where you benefit from a well-regulated trade in all manner of services.