I don’t they are really clean and white though are fed kibble. They are both going though 2 and 4. My daughter diligently brushes our chihuahuas teeth every night. Our Chihuahua has genetically bad teeth. He is about 12 years old. Teeth cleaning does keep his bad teeth at bay. He does love to knaw on the whimsies sometimes or hard biscuit is good enough for his teeth he did loose a tiny front knibble tooth. Either that was coming out or was going to be impacted regardless I am careful what to give him.