What kind of reconstruction would I need to fix my chin? (photos)

Your chin projection is somewhat prominent and short. A short lower face and deep mentolabial fold would benefit from a sliding genioplasty to lengthen and diminish the chin projection. Simultaneous jawline and submental liposuction will provide a more defined jawline.

You could potentially benefit from jaw surgery. However, if you are just looking for a cosmetic procedure, I would absolutely recommend a genioplasty. This would allow us to move the chin segment forward and down, creating better facial harmony, a stronger jawline and the profile you are looking for.

Chins can be affected by the underlying bone, by muscle tension, by the thickness of one’s skin, and by irregularities in the structure of the skin for starters. In addition to implants designed to strengthen the projection of the chin here are two other options. When irregularities of the skin create unwanted depressions and shadows, using one of the injectable fillers can help smooth the surface. And adding a few drops of a drug such as Botox or Dysport can help reduce unwanted depressions caused by underlying muscles fibers. Both of these are easily performed.

The first step is to evaluate your bite/jaw growth; since the chin should be related to the lip. In your case, with the limited images, it appears that the lower teeth are well behind/tipped back and do not support the lower lip; which makes the chin 'relatively' prominent. This is emphasized with smiling where the lip tissues retract against the lower teeth and the chin becomes over emphasized