https://www.everydayhealth.com/hs/sensitive-teeth/foods-to-avoid/
https://www.mouthhealthy.org/en/az-topics/c/chewing-gum
https://www.colgate.com/en-us/oral-health/conditions/dry-mouth/ada-05-dry-mouth?fbclid=IwAR2jmLqkKUwAO8WV4xpSy9STa-AyzNt0GAo5qe-VjqAParBx4DgDj9HjAfU
https://www.sciencedaily.com/releases/2017/08/170814092719.htm
http://www.mouthhealthy.org/en/az-topics/c/chewing-gum