Anytime the person recommending X is also the person who sells you X, you should be suspicious. The guy who comes to your door saying your roof needs fixing? Th

Anytime the person recommending X is also the person who sells you X, you should be suspicious. The guy who comes to your door saying your roof needs fixing? That guy. Without discounting any of the bad experiences people have had here: I've been going to the same dentist for 30 years. He never suggested teeth whitening to me, even though I obviously could have benefitted from it, and did when I explicitly asked for it. In a way, painless dentistry probably increases the profit-seeking. At one time, drilling and other procedures were incredibly painful. Now they're only painful to your wallet.