Normally, the same tooth lost 2 times will not grow back. There are two sets of teeth in a person’s life, permanent teeth and milk teeth. Milk teeth begin to erupt 4 to 10 months after birth and usually come in by the age of 3. The first permanent tooth (first molar) erupts when a person is about 6 years old, and then the milk teeth are gradually replaced by the permanent teeth in the same position, and generally most people can complete the replacement of all the milk teeth when they are 12 years old. Therefore, if the same tooth falls out 2 times, i.e., both the milk teeth and the replacement permanent teeth have fallen out, no new teeth will grow. If a tooth falls out 2 times, it is recommended to visit your local hospital for symptomatic treatment by a medical professional.