 [ Symptoms ] does marijuana induce cavities  i have heard that dry mouth from marijuana can be a factor for cavities is that true [ Disease ] if you smoke enough marijuana to get a dry mouth and do not brush your teeth because you are stoned then i guess it can have an indirect effect on cavity formation certainly people who use meth crystal tend to get the worst teeth every as the doctor said if you get dry mouth or cotton mouth it is important to try and keep your mouth as lubricated as possible as a dry mouth is a breeding ground for bacteria and can lead to a number of dental problems but its not something i would be overly concerned about