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.




