New discoveries have found exceptions to Mendel's basic laws, but none of Mendel's things have been proven to be flat-out wrong. Hail to the Father of Genetics ! The name is ma-ma-ma-ma-ma-Mendel.
Dental crowns should last on average from 10 to 20 years. Crowns are still subject to fracture and cavities, so it is important to take extra care in brushing and flossing around crowned teeth to prevent them from needing replacement too often.
An impression is taken of the tooth or teeth and then sent to a laboratory where your customized veneer shell is created. Once your customized veneer is created, your dentist will attach the veneer to your tooth. Veneers can last for years with regularly scheduled hygiene visits and proper home care.