When Cannabis Meets the Dental Chair: Managing Clinical and Liability Risks - Julie Goldberg, DDS, CCDS August 2026 E NEWS

 

When Cannabis Meets the Dental Chair: Managing Clinical and Liability Risks

Author: Julie Goldberg, DDS, Professional Dental Risk Specialist at PMIG

As cannabis use becomes increasingly common across the United States, dental professionals are treating more patients who use marijuana for recreational or medical purposes. While legalization has reduced the stigma associated with cannabis, it has not eliminated the clinical and legal challenges it presents in the dental setting.

Cannabis can affect oral health, alter responses to local anesthetics and sedatives, impair a patient's ability to provide informed consent, and increase the potential for treatment complications. For dental practices, understanding these risks, and documenting clinical decision-making appropriately, can help improve patient safety while reducing professional liability exposure.

Cannabis and Oral Health

Cannabis affects the oral cavity in several ways that may complicate diagnosis, treatment planning, and long-term outcomes.

Xerostomia

One of the most common oral effects is xerostomia. Tetrahydrocannabinol (THC), the primary psychoactive component of cannabis, reduces salivary flow by interacting with cannabinoid receptors in the salivary glands. Reduced saliva increases the risk for dental caries, plaque accumulation, oral candidiasis, mucosal irritation and/or halitosis.

Patients who regularly use cannabis should be considered at elevated risk for dental disease and may benefit from enhanced preventive measures.

Periodontal Disease

Several studies have found an association between chronic cannabis use and increased periodontal inflammation, attachment loss, and poorer periodontal outcomes.

Increased Caries Risk

Cannabis users often report increased consumption of sugary foods and beverages following use. Combined with xerostomia, these dietary habits may accelerate caries development.

Delayed Healing

Emerging evidence suggests cannabis may impair immune function and inflammatory responses involved in wound healing. Although research continues to evolve, delayed healing following extractions or periodontal surgery should be considered when treatment planning.

Sedation and Anesthesia Considerations

Cannabis use presents important considerations for dentists providing sedation or anesthesia.

Altered Sedation Requirements

Patients who use cannabis regularly may require higher doses of sedative medications due to increased tolerance. Conversely, patients who are acutely intoxicated may respond unpredictably, placing them at greater risk for oversedation or inadequate sedation.

Cardiovascular Effects

Cannabis may cause:

• Tachycardia
• Orthostatic hypotension
• Increased myocardial oxygen demand

These physiologic effects can complicate sedation and increase cardiovascular risk during dental procedures.

Respiratory Concerns

Patients who smoke cannabis may exhibit airway irritation similar to tobacco smokers, increasing the potential for:

• Bronchospasm
• Persistent coughing
• Airway management challenges

Drug Interactions

Cannabinoids may influence hepatic enzyme activity, potentially affecting metabolism of commonly prescribed sedatives, opioids, and other medications. While clinically significant interactions vary among individuals, practitioners should recognize cannabis as a potential modifier of pharmacologic response.

Disclosure Challenges

Many patients underestimate or fail to disclose cannabis use unless specifically asked. Terms such as "occasionally" or "socially" often provide insufficient information for safe treatment planning.

Informed Consent and Decision-Making Capacity

Cannabis also raises important medicolegal considerations.

Acute intoxication may impair judgement, short-term memory, attention and/or decision-making capacity. These effects can compromise a patient's ability to understand risks, evaluate alternatives, and provide legally valid informed consent.

Patients who are intoxicated may also have difficulty remembering postoperative instructions, increasing the likelihood of noncompliance and poor outcomes.

Practical Risk Reduction Strategies

Dentists can reduce both clinical and legal risk by implementing consistent office protocols.

Strengthen Medical History Screening

Update health history forms to include questions about cannabis use, including:

• Medical or recreational use
• Frequency of use
• Method of consumption (smoked, vaporized, edible, tincture)
• Date and time of last use

Normalize these questions by asking every patient rather than targeting specific individuals.

Assess Before Every Sedation Appointment

Before administering sedation or anesthesia:

• Confirm the patient's most recent cannabis use.
• Evaluate for signs of intoxication, including impaired coordination, altered speech, delayed responses, or unusual behavior.
• Consider postponing elective procedures if impairment is suspected or recent cannabis use may increase procedural risk.

Modify Treatment Planning When Appropriate

Patients who regularly use cannabis may benefit from:

• More frequent preventive care appointments
• Prescription-strength fluoride therapy
• Saliva substitutes or products that stimulate salivary flow
• Additional periodontal monitoring
• Shorter appointments for anxious patients

Tailoring care to each patient's risk profile demonstrates thoughtful clinical judgment and supports defensible decision-making.

Reinforce Communication

Provide postoperative instructions both verbally and in writing.

For patients whose comprehension or memory may be affected, consider asking them to repeat key instructions to confirm understanding. When appropriate and with the patient's consent, involve a responsible adult in postoperative discussions.

Document Thoroughly

Documentation remains one of the strongest defenses against malpractice claims.

Record:

• The patient's reported cannabis use
• Timing of last use
• Clinical observations
• Assessment of decision-making capacity
• Any modifications to the treatment plan
• Informed consent discussions
• The rationale for proceeding with or postponing treatment

If treatment is deferred because of suspected impairment, document the specific observations that supported the decision.

Conclusion

Cannabis use is not an automatic contraindication to dental treatment, but it does introduce variables that can affect patient safety, treatment outcomes, and professional liability.

By incorporating cannabis screening into routine medical histories, carefully assessing patients before treatment, modifying care when indicated, and documenting clinical decision-making thoroughly, dentists can better protect both their patients and their practice.

As cannabis use continues to increase, proactive risk management will remain one of the most effective tools for reducing malpractice exposure.

 

This article is intended to provide general information only on certain risk management topics and is not intended to provide any coverage determinations or coverage positions, nor is it to be construed as providing legal, medical, or professional advice of any form.

 

References

American Dental Association. Cannabis: Oral Health Topics. https://www.ada.org

American Society of Anesthesiologists. Cannabis and Surgery: What Patients Need to Know.

National Institute on Drug Abuse. Marijuana DrugFacts. https://nida.nih.gov

Versteeg PA, Slot DE, van der Velden U, van der Weijden GA. Effect of cannabis usage on the oral environment: A review. International Journal of Dental Hygiene. 2008;5(1):1–8.

Cho CM, Hirsch R, Johnstone S. General and oral health implications of cannabis use. Australian Dental Journal. 2005;50(2):70–74.

Little JW. Dental management of the medically compromised patient. 10th ed. Elsevier; 2024.

American Association of Oral and Maxillofacial Surgeons. Clinical considerations for patients using cannabis undergoing office-based anesthesia. Clinical Paper. 2024.