https://www.mouthhealthy.org/en/az-topics/f/fluoride
http://www.bing.com/videos/search?q=Dental+Hygiene+Videos&&view=detail&mid=C9B2C3CBCB83E24957E8C9B2C3CBCB83E24957E8&rvsmid=C9B2C3CBCB83E24957E8C9B2C3CBCB83E24957E8&fsscr=0&FORM=VDFSRV