1.   But if the nerve is exposed, parents and dentists will have to discuss the best options, which might include a replacement tooth.

2.   Dentists will know how to turn on long-dormant genes and prompt patients to fix their own cavities or grow their own replacement teeth.

3.   Eighteen months after her jaw was broken, Sobrero is hoping to get a replacement tooth soon.

4.   Then a replacement tooth, or crown, is attached to the metal post.