No, it is not true that humans get new teeth after the age of 100. The common belief that humans get a second set of teeth at an advanced age is a myth. In reality, humans have two sets of teeth throughout their lifetime: the primary (baby) teeth and the permanent (adult) teeth.
Typically, children start getting their primary teeth around six months of age, and they will eventually have a full set of 20 primary teeth. These primary teeth start to fall out around the age of six or seven, making way for the permanent teeth to emerge. By the age of 12 to 14, most people will have all of their permanent teeth, which usually total 32, including the wisdom teeth (third molars).
Once the permanent teeth have emerged, there are no natural replacements for them. Unlike some animals, such as sharks, who continuously replace their teeth throughout their lives, humans do not have a biological mechanism for growing new teeth after their permanent teeth have fully developed.
As humans age, their teeth and oral health may be subject to various changes and challenges, including wear, decay, and gum disease. It's crucial to maintain good oral hygiene, visit the dentist regularly, and follow a balanced diet to ensure the best possible oral health throughout life.