Here is what you need to know: You cannot be burned by a low level laser. The treatment is painless. You may feel some warmth which is the damaged tissue responding to the light. Light produces energy just the way photosynthesis does in plants.
Since the 1960’s, physicians have used laser therapy to repair damaged tissue and destroy unwanted cells. Lasers can be tuned to different wavelengths to remove plaque from coronary arteries, to seal off leaky blood vessels in the eyes of people with diabetes to preserve sight, and to reattach retinas, the light sensing structure in the back of the eye.
Doctors have used low-level light therapy to activate a number of biological processes, including hair growth and skin repair, without knowing how it worked. In an article in Science Translational Medicine, the Harvard researchers identify transforming growth factor beta-1 as the regenerative protein.
All I can tell you is that whenever I have an injury, pain, soreness, I use the laser and it works!