Do I have a weak jawline and chin? I have a moderate overbite, is it the cause? What can I do to improve it? (photo)

It's best to begin by consulting with a surgeon in-person to discuss your options. During your initial examination, your #chin will be evaluated along with the neck and jawline. A weak #chin implies a lack of chin support for the skin along the neck line. In younger individuals a chin implant alone is usually all that is needed to improve the appearance of the neck. Subsequently, it will also improve the overall #balance of the face and can create the illusion of a smaller nose. As a stand-alone procedure, chin augmentation can be performed in the office under local #anesthesia. For individuals with signs of #aging in the neck, a chin implant added to one of the recommended procedures above, will provide optimal results. Liposuction under the chin is also another option your doctor can discuss. If you are not a candidate for chin or neck rejuvenation at the time of your #consultation, your board certified plastic surgeon can recommend alternatives to address your concern. 
However, there may be additional options to improve the appearance of your concern to improve the overall balance of your face. Such can be best evaluated in-person. Consulting with a board-certified plastic surgeon who specializes in #face, #neck and #chin procedures is important to ensure you are receiving the best advice, care, and surgical experience possible.

The treatment that select will depend on several factors. An excessive overbite can produce a recessive chin. If you want your bite corrected, then you will require orthodontics and orthognathic surgery and/or including a genioplasty. If you are not concerned about your bite, then you are a candidate for a advancement genioplasty or chin implant. For extremely recessive chins, the genioplasty will allow for a greater advancement. I hope this was helpful.

Without in-person evaluation it is impossible to give you good advice. If your bite deformity is significant that require orthognathic surgery (jaws alignment) that would be solution for most of your cosmetic concerns, Possibly sliding genioplasty may be added to jaw surgery? However, if your bite deformity is mild and can be corrected with orthodontic treatment than correction of the lower jaw and chin can be achieved with chin and possibly jaw implants. Evaluation by an orthodontics, oral-maxillofacial surgeon and board certified plastic surgeon would help. Good luck.