https://www.nytimes.com/2017/03/23/health/dental-care-older-americans.html?_r=0
http://www.deardoctor.com/articles/guide-to-dental-injuries/page4.php
https://www.smilebrilliant.com/articles/tooth-sensitivity-causes-solutions-prevention
http://www.gotoapro.org/why-see-a-prosthodontist/