Benefits of External or Internal Incision Site for Chin Implant?

My personal preference is the external incision.  The infection rate is lower (the mouth is impossible to completely sterilize), and implant positioning tends to be more favorable than with the intraoral approach.

This is a point of ongoing debate amongst plastic surgeons. I personally prefer to do my chin implants by using an external incision made just underneath the chin. I prefer doing chin implants in this manner because there is less chance of an infection occurring using this method. When you place a chin implant thru the mouth (internal incision), you cannot do so in a completely sterile manner. By definition, the mouth will always be contaminated with bacteria. If you are attempting to place a sterile implant via a non-sterile route, you will risk developing an infection and possible need to remove the implant. I don't think there is an credence in being able to place the implant any lower along the jawline using an internal approach. If anything, you would have an advantage coming from an external approach. Find a board certified plastic surgeon in your area who has plenty of photo examples of chin implant/augmentation and is willing to explain in detail their preferred method.

Chin implants can be undertaken through either intraoral or external incisions. The infection rate through the intraoral incision is slightly higher than with the external incision but still fairly minimal. With the intraoral incision you do run a slightly greater risk of changing the way that your chin moves but in some cases this can be advantageous. The external approach leaves a small scar on the chin but this is usually well hidden under the chin. In the end, there is no clear advantage to either and it comes down to surgeon and patient preference.