This type of logic doesn't really hold for healthcare providers, at least not in the US. The licensing restrictions is how they make their money. The demand for service so far outstrips the supply of providers that they don't really need individual repeat business. They'll do just fine with positive word-of-mouth. In the specific case of dental care, there is also the problem that "fixing" the immediate problem generally can't fix the root cause, which is some combination of bad genetics and people constantly drinking loads of nearly pure sugar. As long as those things don't change, you'll keep coming back with new problems even if they fix the old ones.
> They'll do just fine with positive word-of-mouth.
Sometimes you don't even need that.
If you ever want to feel depressed, go to your city's subreddit and search for "what business will you never go to again?" I remember one popped up on my city's sub recently, and it made me incredibly thankful for my dentist. The sheer amount of shit some get away with (while having ritzy offices in expensive neighborhoods) is incredible. And sure, such a thread is bound to attract people who have had negative experiences, but the sheer quantity of complaints some places had (with nobody chiming in to defend them or say something to the effect of "I've never had any problems like that") spoke for itself.
