Will a three year old shih tzu grow teeth back?

A three-year-old Shih Tzu will not grow new teeth if they have lost any, as dogs typically have two sets of teeth in their lifetime: baby teeth and adult teeth. By the age of three, a Shih Tzu has already developed its adult teeth, which do not regenerate. If a dog loses a tooth due to injury or dental disease, it is important to consult a veterinarian for advice and potential treatment options.