She discovered that people who reported smoking cannabis at least once a month for more than a year had a 17% higher chance of having untreated coronal caries (cavities), 55% higher odds of root surface caries and 41% higher odds of severe tooth loss compared with patients who did not smoke marijuana after controlling for age, sex, race or ethnicity, education, income or alcohol consumption.

“Frequent” being once a month seemed low, but those risk changes are definitely significant.