Sometimes a snake tooth will be lost, when it bites. This is a normal part of life. If one is left embedded in your skin, treat it as a splinter, though a tooth usually comes out easier than most splinters. Reptiles are physiologically incapable of having rabies, a definite advantage over dogs and cats. Most turtle bites are pinches and will not draw blood.
Larger tortoises can have a good bite, though.
Especially small children's soft hands should be kept in a save distance. The most unpleasant part of being bitten by a turtle is, often, to get the animal off. My reptile is skittish. With a lot of patience. Once the animal tolerates you walking by the cage, changing the water bowl, feeding, and cleaning, you can try and touch it gently or even catch and hold it.