https://www.colgate.com/en-us/oral-health/life-stages/adult-oral-care/looking-after-your-teeth-five-new-years-resolutions-for-a-healthier-mouth-1214
https://www.medicalnewstoday.com/articles/322577.php
https://www.colgateprofessional.com/education/patient-education/video-library/an-overview-of-gum-disease
http://www.webmd.com/oral-health/video/what-teeth-do