Energy density plays a crucial role in the effectiveness of laser therapy. This density depends on the applied power and the duration of the treatment. After high energy delivery, the amount of laser energy absorbed by the body’s tissues increases. The laser’s ability to penetrate tissues and the energy delivered depend on the wavelength and power level used. However, the power must be properly modulated and adapted according to the patient’s sensations, the treatment area, and the pathology. This ensures maximum effective energy delivery while protecting surface tissues from excessive power.