In general, laser treatment is affected by a lot of variables, such as skin tissue types, skin condition, disease condition, and skin color, etc.
These different factors affecting the results of laser therapy may lie in different levels of skin (scalp) tissue layers. This explains why multi-wavelength really matters. Laser beams have different penetration depths into scalp depending on their wavelengths. Various wavelengths reach different levels of scalp, overcome various troubles at each level, and carry out treatment roles. Therefore scanning a multi-wavelength laser simultaneously is more effective for treatment than scanning a single wavelength laser. When 670,780,830nm wavelengths of Wellay Hair Laser are scanned on a same area of scalp, each wavelength reaches a different level of scalp tissue, cures hair loss caused by many different troubles, and eventually stimulates hair growth.
The multi-wavelength Wellay Hair Laser in your hand is the most scientific and decent therapy for your scalp health.