True or False: No more enamel is produced after tooth eruption, and it gradually wears down over time.

The statement is true because enamel is a highly specialized and mineralized tissue that forms the outer layer of teeth. In both humans and animals, enamel development ceases once the tooth erupts into the oral cavity. This means that no new enamel is formed after eruption, and the existing enamel continues to experience wear and tear over time due to various factors such as mechanical abrasion from chewing, dietary influences, and acid attacks from bacteria. Therefore, as the animal ages, the enamel can become thinner and may show signs of wear, contributing to dental issues such as sensitivity or increased risk of cavities. This lack of regenerative capacity in enamel makes it particularly important to maintain dental health through regular check-ups and proper oral hygiene.

Other options might imply that enamel continues to form in certain circumstances, which contradicts the established understanding of tooth development and enamel biology.