"Effect of Low Level Laser Therapy on Neuropathic Pain After Neck Dissection Surgery''"

Low Level Laser Therapy sometimes known as Low Level Light Therapy or Photobiomodulation (PBM) is a low intensity light therapy. The effect is photochemical not thermal. The light triggers biochemical changes within cells and can be compared to the process of photosynthesis in plants, where the photons are absorbed by cellular photoreceptors and triggers chemical changes.

Placebo Low Level Laser Therapy:turning on the device with covering probe by aluminum foil and ask patient to wear sun glasses to obtain the placebo effect.