Porcelain veneers can be used to repair minor tooth imperfections and defects. Porcelain veneers can often be an effective method by which to make cosmetic changes in teeth that are chipped, worn, stained, crooked, or discoloured. Teeth enamel discoloration can be caused by staining, aging, or chemical damage or naturally discoloured, such as teeth with tetracycline or fluorosis staining. Common causes of teeth discoloration are medications, coffee, tea or cigarettes. Genetics play an important role, some people have naturally whiter enamel than others.