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
https://www.mayoclinic.org/healthy-lifestyle/adult-health/in-depth/dental/art-20047475
https://www.livestrong.com/article/529504-is-apple-cider-vinegar-bad-for-tooth-enamel/
https://www.sciencedaily.com/releases/2015/10/151021115120.htm