A recent survey conducted in 2025 indicates a rise in cannabis use in Canada, which has significant implications for dental care. Cannabis can potentially alter the effects of medications used in dental treatments and may be linked to an increased occurrence of oral health issues.

Impact on Dental Pain Medications: 

Research suggests that combining acetaminophen with CBD may lead to adverse liver effects, indicating a potential risk when these substances are used together.

Interaction with Local Anesthesia and Sedation: 

Studies have indicated that local anesthetics containing epinephrine might worsen the cardiac arrhythmias typically induced by cannabis metabolites. Following marijuana use, heart rate can increase by 20% to 100%, peaking 10 to 30 minutes after consumption.

Effects of Cannabis on Oral Health:

·      Cannabis, Dry Mouth, and Tooth Decay: Research has shown that cannabis users often experience dry mouth (xerostomia) after consumption. One study found that 70% of cannabis smokers reported symptoms of xerostomia, which can last from 1 to 6 hours after use. Additionally, cannabis consumption affects leptin, a hormone that regulates appetite, leading users to feel hungry. The combination of dry mouth and a diet high in sugary foods and drinks can increase the risk of tooth decay.

·      Cannabis and Oral Cancer: Cannabis smoke contains twice as many carcinogens as tobacco smoke, potentially increasing the risk of oral cancers. Some studies have also reported a higher risk of head and neck cancers associated with cannabis use.

Recommendations for patients who use Cannabis products:

-             Advise your dental health provider of any health updates including a change in any medication.

-             Your dentist may advise you stop Cannabis use for  24-48 hours prior to dental appointment to avoid interactions or complications.

-             Your dentist may decline to work on you if you were under the influence, for your safety.

-             Usage of high fluoride tooth paste and mouth wash can help with the dry mouth .

-             Use of proper brushing and waterpik techniques , helps to reduce from the risk of cavities.

Source : J Can Dent Assoc 2025;91:p12