https://www.colgate.com/en-us/oral-health/conditions/dry-mouth/ada-05-dry-mouth?fbclid=IwAR2jmLqkKUwAO8WV4xpSy9STa-AyzNt0GAo5qe-VjqAParBx4DgDj9HjAfU
https://www.mouthhealthy.org/en/az-topics/f/fluoride
http://www.colgate.com/en/us/oc/oral-health/life-stages/oral-care-age-55-up/article/oral-health-for-seniors
http://www.everydayhealth.com/oral-head-and-neck-cancer/dentures-and-oral-cancer.aspx
https://www.youtube.com/watch?v=xdMIfEHArWs