3 ms·One presumes it "works" in the sense of "it does what it's been engineered and tested to do"by warrenm 5y agoOne presumes it "works" in the sense of "it does what it's been engineered and tested to do"zardo 5y agoRight but is that, shines red light on your gums, or kills bacteria with red light?warrenm 5y agoWhat does the article say? :)