How big are the screws used in a sliding genioplasty?

The reason your chin looks bigger or more ‘witchy’ is because the genioplasty pushed the bone forward. There are some non surgical ways with fillers to treat this but sometimes revision surgery is needed. Consider a consultation to discuss the details. 

Based on your photo. Two issues are producing the appearance you don't like. 1) Your face looks long because your cheeks are underdeveloped. Augmenting them by fat transfer (yes properly performed it is permanent), Fillers (temporary), or implants will fix that. 2) Your eyes aren't low, your ha...

Hello Ellie, The lower third of your face (where the chin is located) is a little long, and this can be corrected with a vertical shortening of your chin bone.  This surgery is done through an intraoral approach (leaving no visible scars),and it won't change your teeth alignment. ...

I agree that soft tissue changes although subtle will still be expected over the next 4-6 months and in general you do not want to be premature to assess your final results until then.  It is true that your photos are not consistent which makes it difficult to objectively assess your...

Hi! Numbness of the lower lip and chin may take up to 12 months to fully recovery. I would suggest if the numbness doesn’t go away by the one year mark that you revisit with your oral surgeon. Yes, nerves can get damaged during the procedure which can then lead to p...

Assuming you are not a candidate for orthognathic surgery based on an orthodontically corrected bite, a vertical chin reduction would be of benefit. You refer to it as a sliding genioplasty but it is more accurately called a wedge reduction bony genioplasty for vertical chin shortening.