Health, I was going to bring up that RD article on crooked dentists. If I recall correctly, the writer got his teeth evaluated by an honest dentist who said he needed some minor work. He then went to dentists all over the country, finding that the vast majority recommended way more work than he needed. even to the extreme of extracting all his teeth.
My childhood dentist was drill-happy. I suspect he filled way more cavities than he needed to. He ended up a suicide. I’ve had two teeth break and require crowns because they were weakened by his fillings.
As for honest mechanics, I recommend Maven Motors on Jamaica Avenue in Richmond Hill, Queens (not a bad drive from Brooklyn if you take the Jackie Robinson).