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the main role of the low-energy laser bio-stimulation (bio stimulation), that is, through the give appropriate energy to stimulate the biological cells and induce or strengthen a number of physiological responses, including to promote local blood circulation, regulate cell function, enhance immune function, promote cell metabolism and proliferation. wavelength of 650nm-660nm red laser just in human eye color of the visible spectrum, so we can see the red light 650nm -660nm can penetrate the organization up to 8-10mm