I took out a loan to get crowns. The dentist told me I would have no problem keeping them in. I told him I was on meds that would make my gums swell and my doctor told me that they would be pushed out. They assured me this wasn't the case. So less then 2 years later. I was having trouble with them coming out repeatedly. Then it came to the point where the whole unit came out. They told me that they couldn't really do anything. Even though they told me that they would stay in.