Causes that have been proposed include medications, hyposalivation, poor oral hygiene, oxidizing mouthwashes (eg, hydrogen peroxide), alcohol, smoking, and infection
However, when Tommy looks into it, he discovers that Anna did in fact die, she kept escaping the family she lived with and was eventually taken to Australia, where she died of spring fever
Technically, although it is healthier than smoking, vaping is still not safe
Very Unhealthy (201-300) Health alert: everyone may experience more serious health effects
You can also try a vinegar solution (equal parts vinegar and water)
However, some vape users stated that the flavor was a bit too sweet for them