https://www.atelierdosorriso.pt/en/blog/fotona-4d/
PIANO mode is the third dimension, and it delivers bulk heating to the skin's deeper layers. This step is all about tightening. The uniform heat application encourages collagen remodeling, which firms up loose skin and improves texture. PIANO mode is particularly effective for those with sagging skin, offering a firmer and more lifted appearance over time.