Is Sliding Genioplasty enough for a double chin?

An excessive soft tissue chin pad and a bony chin prominence can be effectively reduced by a submental chin reduction procedure.

Those are all symptoms that sound more consistent with scar contracture/scar tissue into the bony stepoff than nerve damage. Knowing how much your chin was advanced would be helpful information also.

Both the procedures have advantages and disadvantages. It seems to me that plastic surgeons seem to be more in favor of using chin implants while oral surgeons seem to be more of the school of sliding genioplasty. For those who need vertical and horizontal augmentation a sliding genioplasty may...

The only way to have better insight into the amount of movement that looks natural vs unnatural to you is computer imaging. See what the difference is between 5 and 7mms...which will be very hard to see as neither one will likely look unnatural which for a male usually may occur when the chin...

You have a somewhat deep mentolabial fold and moving the chin down 5 mm will diminish the fold. If he is moving it forward 5 mm then the effects on the mentolabial fold will provide a good balance. You may need an advancement of 6-7 mm.

Given your horizontal chin deficiency, a sliding genioplasty which brings the chin forward will help get rid of the extra skin and fat under the chin by stretching out the tissues. You may want to add submental liposuction to the sliding genioplasty to get the best submental reduction,