If you earn more per hour than the mechanic, it will possibly be more cost-efficient to let him do it. I didn't know dentist could earn this much money by recommending stuff. I thought they only ask a small handful of them, like "7 out of 10 dentists recommend...". Who knows when they even asked those 10 dentists, could've been back in 1970 for all I know. Anyway If I were a dentist I wouldn't even bother fixing people's teeth. I'd simply recommend shit and chill at home.