Why Can't a 14 Year-old Have a Chin Implant?

Chin implants shouldn't really be placed until someone's facial growth is complete. The jaw will likely continue to grow if your son is 14 so placing an implant now may ultimately produce an improper result.

If your son has a disfigurement, like you describe, this may be å more significant issue that would be better addressed by a craniofacial surgeon or oral surgery. They can assess your son to see if surgery to change the position of the upper and/or lower jaw would help with your son's facial issues.

I understand your concerns but altering the facial skeleton too early will yield significant disfigurement. To correct this will require major reconstructive surgery. Once he has stopped growing he can potentially have a chin implant.  Sorry!