From this 2020 review, "Potential oral health effects of e-cigarettes and vaping: A review and case reports": https://vencedds.com/wp-content/uploads/2020/12/VAPING-PAPER-FIONA-DONOVAN-VENCE.pdf >There are currently over 10 000 commercially available e-liquid formulations 7 (Table 1). These formulations basically have three components: a base, nicotine, and flavors. All three of these components have the potential to negatively affect oral health.