Yes. Generally it it s hereditary condition called congenitally missing teeth but in most cases it is one or two teeth missing. I've never heard of none whatsoever
Yes. People can be born with only one set of teeth- or with no sets of teeth at all. However, both conditions are extremely rare. In such a case, a dentist would likely implant teeth directly into the jaw bone.
No that not possible to born Without no teeth underneath. the posiiblity casulities is negative for born of human. if the teeth without is the some loss of energy during the birth.