You Don't Have Me When You're Born

Riddle: You don't have me when you're born, but you have me after. But a few years later, I leave again, and you don't have me anymore. But I don't stay away permanently, and I come back in different form. What am I?

Answer: Teeth.

Source: https://www.riddles.com/9682

You don't have me when you're born, but you have me after. But a few years later, I leave again, and you don't have me anymore. But I don't stay away permanently, and I come back in different form. What am I? — You don't have me when you're born by Angie and Tammy v1.

Riddle: You don't have me when you're born, but you have me after. But a few years later, I leave again, and you don't have me anymore. But I don't stay away permanently, and I come back in different form. What am I? Answer: Teeth. — by Angie and Tammy v2.