Yes, some cats may not need teeth replacement. This is usually because their teeth are in very good health, or because their diet keeps their teeth clean and healthy. However, most cats will need their teeth replaced, just like humans. When cats are kittens, they replace their baby teeth and then their permanent teeth as adults. This process usually begins around 6 months to 1 year old and may continue until the cat is around 2 years old.
If your cat does not have teeth or there are problems during the tooth replacement process, it is recommended that you consult a veterinarian. Your cat's dental health is very important to their overall health, so you should make sure to treat it when necessary.