https://www.colgate.com/en-us/oral-health/life-stages/adult-oral-care/how-acidic-foods-affect-teeth-and-which-to-avoid-1215
http://www.dailymail.co.uk/health/article-3663839/E-cigarettes-toxic-mouth-Vaping-kills-cells-oral-cavity-raising-risk-disease.html#utm_sguid=160550,d5d8d5fb-538c-98f2-1a32-db450ce80215
