Can Sagging from Jaw Reduction Surgery Be Corrected by a Lower Facelift?

Masseteric hypertrophy or laxity is rarely performed in the USA but is more common in Asia. Injection of botulinum toxin is one non-surgical options. A modified or short scar face lift is a reasonable option to treat lower facial laxity following jaw reduction surgery.

Looseness of the skin can absolutely be affected by jaw surgery.
After a sufficient period of time has passed, usually 6 months, it may be appropriate to tighten the skin if it has become a persistent problem. For the jawline, a necklift done from below the chin would typically not be helpful, but a facelift type procedure would.