https://www.nytimes.com/2017/03/23/health/dental-care-older-americans.html?_r=0
https://www.webmd.com/oral-health/guide/tooth-enamel-erosion-restoration#1
https://www.colgate.com/en-us/oral-health/basics/nutrition-and-oral-health/ada-march-is-national-nutrition-month
https://www.mouthhealthy.org/en/az-topics/c/chewing-gum
https://www.mouthhealthy.org/en/az-topics/f/fluoride
https://www.youtube.com/watch?v=rtpYi_Tm2Js
http://www.dentistryiq.com/articles/2017/02/the-surprising-link-between-periodontal-disease-and-heart-health-what-dental-professionals-need-to-know.html
https://youtu.be/3SwYRfMc53U
https://www.tcdentalpros.com/before-and-after-photos/
https://www.bing.com/videos/search?q=periodontal+disease+video&qpvt=periodontal+disease+video&view=detail&mid=6309824462C735AE4E8F6309824462C735AE4E8F&&FORM=VDRVRV