Marijuana use was the strongest predictor of dry mouth across all age groups in a dental clinic study | Research

The takeaway

Among 1,600 dental patients, marijuana use was the strongest independent predictor of hyposalivation and dry mouth across all age groups, with a 3.1 times higher risk.

Dentists, dental hygienists, cannabis consumers concerned about oral health, and public health professionals.

What the researchers found

Hyposalivation and xerostomia affected 44% of patients (705 of 1,600). Marijuana use was the strongest independent predictor across all age groups (RR=3.10). Mental health and cardiovascular medications were also significant predictors.

Why it matters

Dry mouth accelerates tooth decay, gum disease, and oral infections. With rising cannabis use among younger populations, dentists need to recognize marijuana as a major risk factor.

The numbers in context

44.06% prevalence of hyposalivation/xerostomia (705/1,600 patients). Marijuana: RR=3.10. Chi-squared=205.99, p<0.001.

How the study worked

Retrospective cohort study of 1,600 randomly selected dental patients aged 30+ treated between 2014-2023 at UNLV School of Dental Medicine. Data extracted from electronic health records. Multivariate logistic regression identified risk factors.

What this study cannot tell us

Retrospective design with reliance on self-reported marijuana use. Single institution. Cannot distinguish between different cannabis products, doses, or frequency.

How to read the evidence

Reasonable sample size with multivariate analysis, but retrospective design and self-reported cannabis use limit strength.

When this study was published

2025 publication using 2014-2023 clinical data.

The bigger picture

As cannabis use becomes more normalized, its oral health consequences deserve greater clinical attention. Chronic hyposalivation significantly increases risk for cavities, periodontal disease, and oral infections.

Questions still open

Does the method of cannabis consumption affect dry mouth risk differently?
Can targeted interventions mitigate cannabis-related oral health damage?

Common questions

Why does marijuana cause dry mouth?

THC binds to cannabinoid receptors in the salivary glands, reducing saliva production. This effect can become chronic with regular use.

What oral health problems does dry mouth cause?

Saliva protects teeth from decay, controls bacteria, and aids digestion. Chronic dry mouth increases risk of cavities, gum disease, oral thrush, difficulty swallowing, and bad breath.

Read the original research

Impact of Medications and Marijuana Use on Hyposalivation and Xerostomia in Adults.

International journal of environmental research and public health, 22(11)

View on PubMed ↗Publisher’s paper ↗

Citation

Gehlken, Carter; Ahmadian, Moni; Abubakr, Neamat Hassan. (2025). Impact of Medications and Marijuana Use on Hyposalivation and Xerostomia in Adults.. International journal of environmental research and public health, 22(11). https://doi.org/10.3390/ijerph22111700