Starlite Smile Oral Care Gum Disease Light Tray for Android, iPhone, USB, USB-C * Harvard Magazine says LED Blue Light Therapy is a discovery with important implications for... (helping) periodontal disease. * Scientists at the Forsythe Institute have found that blue light can be used to selectively suppress issues commonly associated with destructive gum disease. * Harvard Magazine says LED Blue Light Therapy for halitosis...light therapy gets at it's root cause...rather than simply masking their odor as mints and mouthwashes do. * 16 BRIGHT LEDs Gum Device has Adapters for iPhone, USB, USB-C, Android (compatible with 4G or newer). Never needs batteries. * Also a Teeth Whitening Light, works with any teeth whitening gel or teeth whitening strips (sold separately). May help with Gum Disease, Tooth Pain, Toothaches, Bleeding Gums, Sore Gums, Red Gums, Periodontal problems.