When you're a young child going to the dentist, it can be scary. Not everyone feels comfortable sitting in that big chair with a huge light hovering over his or her head. But when someone is an adult and still gets chills when thinking about a supposedly trustworthy dentist working on their mouth, something is wrong.

That describes the feeling of one person who fell victim to a crook who just so happened to work on teeth too. Dentists are fantastic, but like in any job, some are out for money (and not your well-being). Take this guy who was profiled by ABC News as an example. He put a lot of people in unnecessary pain and now serves time in jail for it -- not to mention a slew of lawsuits from ex-patients.

Phantom billing is another way to subtly charge someone's insurance for services never actually performed. It can drive huge amounts of money and max out your benefits if left unchecked. While this is certainly not an epidemic, it goes without saying that you should stay keen. Some people may not have to worry about this issue, as they see the same professional year in and year out. But be wary of sudden surgeries or get a second opinion if insurance won't cover certain expenses. However, if you have a family doctor that you already entrust your dental care with, no need to worry!