So the dentist in the license-free world have no ecnomic motivation to not just rip peoples teeth out with a pair of pliers?
People can self-regulate for risk and safety when they have complete information about the business. That would not have been available decades ago, but today we have the Internet and can easily move to interconnect everyone with common protocols to discern reviews and criticism of business to give consumers a more informed choice when choosing potentially dangerous trades, without crippling innovation and entrepreneurship within their domains.