As versatile as veneers are, there are three main conditions that could keep someone from being eligible:
Decay – If the tooth underneath a veneer has an untreated cavity, the decay could worsen and become even more difficult to treat.
Gum disease – If your gums are swollen or bleeding during the impression process, it could cause your veneers to end up fitting incorrectly. Additionally, if your gums recede later on, the margins of the veneers might be exposed.
Bruxism – Before veneers are placed, bruxism (chronic nighttime teeth grinding) should be addressed. Otherwise, your veneers are at-risk of becoming worn or fractured or even falling off of your teeth.