Whenever there's information asymmetry that financially benefits one party you have to be cautious. It's been shocking how many times people I know have sought second opinions on recommended dental work only to be given a completely different recommended treatment that's thousands of dollars cheaper.

Example from a friend: Dentist 1 - you need ten fillings today! Dentist 2 - You have a few risk spots but let's just keep an eye on it.

Went with the second recommendation and didn't have any issues and that was a decade ago.