My Lumineers look good but I probably have to return to the dentist about once every 2 months because one has fallen off. I just got back from the dentist after he replaced a repaired Lumineer (it had cracked and fallen off). My dentist had sent it back to the manufacturer to have it repaired. That very same Lumineer came off again only about 1 hour after I got home. Granted, I have 18 Lumineers, so the odds are greater that one will come off. However, if I had to do it all over again, I would have gone the permanent veneer route instead. It's very inconvenient having to go to the dentist office so often.