- Superficial depth, dermis
- The shallowest setting delivers energy within the skin itself, where the target is dermal collagen and skin texture rather than support. It is used on thinner skin and on smaller areas where a deeper setting would be uncomfortable or unnecessary.
- Mid depth, deep dermis and subdermis
- Energy is delivered at the junction between the deep skin and the layer beneath it. The target is the fibrous tissue that holds the skin against the fat below, which is where mild laxity in the cheek and jawline tends to sit.
- Deep, the SMAS layer
- The deepest setting reaches the muscular and fibrous sheet under the fat of the lower face. This is the layer a surgeon lifts, and it is the target where the concern is jawline and under-chin laxity rather than skin quality.
- How a plan combines them
- A plan usually combines depths across one session, chosen by the area and by how much fat and laxity is present. The depths used on the face typically sit at around 1.5 mm for the dermis, 3.0 mm for the deep dermis and subdermis and 4.5 mm for the SMAS layer, with shallower settings on thinner skin such as the neck. Which depths are used for your face, and how long the session takes, are decided by your doctor at assessment.