All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.
There is no harm in dental braces if the objective is to bring the teeth to their original position after an accident or deformation. The Prophet said: "O slaves of Allaah, seek treatment." [Ahmad, At-Tirmithi and Ibn Maajah] There is no harm as well in artificial teeth implantation or fitting a partial plate for necessity, like the case of a person whose teeth –or some of it- had fallen off and needs repairing or replacement in order to chew food or speak properly and the like. But if one intends by doing so to cheat or deceive the person who looks at him/her, if it is for the purpose of marriage and the like, then this is forbidden.
Allaah knows best.