Most people in good health are eligible for dental veneers. That being said, there are certain conditions which might complicate getting veneers, such as:
If a tooth has decay this must be addressed before getting veneers
If a tooth is in an area with periodontal disease the disease must first be treated
If a tooth has little enamel left the veneer might not stick to the tooth
If too much of the tooth is missing a dental crown might be a better option
If a person grinds or clenches their teeth this can chip and damage dental veneers