Apparently it is not the e-liquid itself that has a detrimental effect on teeth and gums. It is the nicotine that is the problem.
“Vaping has not been demonstrated to stain teeth…”
“Studies indicate that nicotine does cause recession of the gums. Because it reduces that blood flow that passes through the veins, nicotine helps to deprive the gums of crucial nutrients and oxygen necessary for optimal health. Over time, that can cause gum tissue to wither and die.”
“There is also evidence that nicotine can be a contributing factor in conditions like periodontitis and gingivitis.”
“Nicotine has also been identified as a muscle stimulant, which can cause teeth grinders to intensify that harmful activity.”
https://www.smoketastic.com/vaping-teeth/
“Vaping has not been demonstrated to stain teeth…”
“Studies indicate that nicotine does cause recession of the gums. Because it reduces that blood flow that passes through the veins, nicotine helps to deprive the gums of crucial nutrients and oxygen necessary for optimal health. Over time, that can cause gum tissue to wither and die.”
“There is also evidence that nicotine can be a contributing factor in conditions like periodontitis and gingivitis.”
“Nicotine has also been identified as a muscle stimulant, which can cause teeth grinders to intensify that harmful activity.”
https://www.smoketastic.com/vaping-teeth/