In a deep plane facelift, the surgeon detaches the skin and soft tissues of the face from the underlying muscles and ligaments before repositioning them to create a more youthful appearance. The ligaments are not cut and re-attached, but rather released and repositioned to achieve a natural-looking lift. The SMAS (superficial musculoaponeurotic system) is a layer of muscle and connective tissue that lies beneath the skin of the face and provides support to the soft tissues. In a deep plane facelift, the SMAS is also repositioned and tightened to provide additional support and lift to the face. It is possible for the face to sag after a facelift, regardless of the technique used. However, a skilled and experienced surgeon can minimize this risk by properly supporting and repositioning the underlying tissues and using appropriate techniques to tighten and re-drape the skin. In terms of scarring, any surgical procedure can result in scarring. However, with a deep plane facelift, the incisions are typically well hidden within the hairline and natural contours of the face, and scarring is usually minimal and fades over time. As with any cosmetic surgery, there is a risk of asymmetry or changes to your appearance after a deep plane facelift. However, by choosing a skilled and experienced surgeon and carefully discussing your goals and expectations, you can minimize this risk and achieve a natural-looking result. It's important to have a thorough consultation with your surgeon before undergoing any facial rejuvenation procedure to ensure that you fully understand the risks and benefits and have realistic expectations for the outcome. Best of luck !