What is the main reason that enamel can become worn over the course of an animal's life?

Enamel is indeed thin and has no regenerative capacity, which makes it particularly vulnerable to wear over an animal's lifetime. While enamel is composed of minerals and is the hardest tissue in the body, these characteristics do not prevent it from undergoing wear due to various factors such as bruxism (tooth grinding), dietary abrasion, or even the natural aging process. The thinness of enamel means that, once it is worn down, the underlying dentin becomes exposed, leading to sensitivity and increased risk of dental caries and other dental issues. Therefore, knowing that enamel cannot regenerate emphasizes the importance of dental health care throughout an animal's life to mitigate wear and maintain oral health.