This illustration, created at the Centers for Disease Control and Prevention (CDC), reveals ultrastructural morphology exhibited by coronaviruses. Note the spikes that adorn the outer surface of the virus, which imparts the look of a corona surrounding the virion, when viewed electron microscopically. A novel coronavirus, named Severe Acute Respiratory Syndrome coronavirus 2 (SARS-CoV-2), was identified as the cause of an outbreak of respiratory illness first detected in Wuhan, China in 2019. The illness caused by this virus has been named coronavirus disease 2019 (COVID-19).

Leslie S.T. Fang, MD PhD

Massachusetts General Hospital
Harvard Medical School


On March 16, the ADA has issued the following statement:

“The American Dental Association recognizes the unprecedented and extraordinary circumstances dentists and all health care professionals face related to growing concern about COVID-19. The ADA is deeply concerned for the health and well-being of the public and the dental team. In order for dentistry to do its part to mitigate the spread of COVID-19, the ADA recommends dentists nationwide postpone elective procedures for the next three weeks. Concentrating on emergency dental care will allow us to care for our emergency patients and alleviate the burden that dental emergencies would place on hospital emergency departments.”

“As health care professionals, it is up to dentists to make well-informed decisions about their patients and practices.”

Various local dental societies have issued statements echoing these recommendations.

Coronavirus has a global reach and is in all 50 states, causing unprecedented havoc in every phase of our lives. Aggressive steps at containment are in play, and the world is mustering its resources in addressing the pandemic. Researchers are racing to come up with a solution and more than 50 drugs are being clinically investigated.

COVID-19, the disease caused by SARS-CoV-2, is highly contagious with a rapid velocity of transmission. The disease appears to have a fatality rate that is lower than its predecessors, SARS-CoV-1 and MERS-CoV-2, and the majority of the fatality is in elderly patients and in patients with pre-existing underlying chronic diseases such as cardiovascular disease, diabetes mellitus, hypertension and chronic obstructive pulmonary disease. However, there are young and healthy patients succumbing, heightening the fear of this disease.

In 80% of the cases, COVID-19—particularly in young, healthy patients—is mild and those affected would have symptoms similar to those of a cold or flu. In 15% of cases, the development of progressive respiratory symptoms may necessitate hospitalization. In 5% of cases, the patients are critically ill and would require intensive care unit support. The overall fatality is estimated to be about 2%.

The modes of transmission include droplets, surface contact, fecal-oral route and by aerosolization during procedures. Transmission by asymptomatic carriers have been reported.

Although vaccines have been developed at warp-speed in the United States, Israel, Queensland and in China, it is expected that it would take too long for the vaccines to be deployed during this epidemic because of the time it takes for safety testing and for clinical trials. Clinical trials with antiviral agents such as Remdesivir, chloroquine, hyperimmune globulin and others are in place and would hopefully help with the development of effective therapeutic agents.

As of now, the best protection for the dental professional is a heightened sense of awareness, avoiding unnecessary contact with patients that may have coronavirus, use of appropriate personal protective equipment, and increased attention to personal hygiene.

Recommendations continue to be predicated upon information that arises daily, and you should be mindful of the situation in your local community and the continuing global evolution of the disease.

Transmission electron microscopic image of an isolate from the first U.S. case of COVID-19. The spherical viral particles, colorized blue, contain cross-section through the viral genome, seen as black dots. (CDC)

Risk to the Dental Professional

We are aware of the risk to healthcare workers from the data coming out of Wuhan. Of the initial 44,672 cases, 3,019 (6.75%) were health workers and 7 of those have died as of February 11, 2020. With increasing awareness and the uniform adoption of personal protective equipment, the risk has progressively decreased in Hubei Province.

The dental professional is particularly at risk if working on an infected patient because of the close contact with and the risk of blood, saliva, and droplet exposure.

Centers for Disease Control and Prevention (CDC) Recommendations

CDC Recommendations are designed primarily for health workers. However, because of dentistry’s unique circumstances., I have made modifications to tailor those recommendations for dental professionals.

The most important difference between a medical and dental professional in this situation is that a great deal of dentistry can be deferred to a later time, whereas the medical professional is obligated to see patients when they are sick. The modifications to the recommendations minimize the likelihood of contact with an infected patient and also minimize transmission of the disease.

Coronavirus and the Dentist: Recommendations for the Dental Professional

The CDC, OSHA, AGD, and ADA have all made recommendations for dental professionals. The following is a culmination of these recommendations with an eye towards addressing important practical issues.

  • Administrative Controls
  • Engineering Controls
  • Environmental Hygiene
  • Correct Work Practices
  • Personal Protective Equipment
  • Strict Adherence to Standard, Contact and Airborne Precautions

Note that we have made modifications to reflect the circumstances unique to dentistry.

Administrative Controls

  • The Overarching Question
    • Is this an emergency?
      • Assess the urgency of the patient visit, including pain, swelling or trauma.
      • All elective dental procedures should be deferred.
      • The patient should be rescheduled 30+ days down the road.
      • Although this is an imposition on the staff and the patient, everyone will be appreciative of your concern for their welfare.
  • Prior to the Patient’s Arrival
    • In general, one should avoid walk-in visits.
    • When the patient calls for an appointment, the front desk should ask if:
      • They are sick with fever, cough, sore throat, muscle pain, GI symptoms.
      • They have had foreign travel within the past 30 days.
      • They have been on a cruise
      • They have been in contact with patients diagnosed to have COVID-19
    • All patients who answer in the affirmative should not have dentistry—even if it is an emergency—because of the risks to other patients and staff. They should be referred to a setting where proper isolation is possible.
    • Instruct patients to take their temperature before coming to your office. Encourage these patients to reach out to their medical doctor for evaluation and management.
    • Instruct patients to arrive on time for appointments, not early, to minimize waiting in our office and to decrease the number of people present.
  • Upon Patient’s Arrival
    • Make every attempt to keep the waiting room empty.
      • Consider having anyone driving patients wait in their automobile until the patient is finished
      • Indicate that you will call or text the driver at the appropriate time
    • There should be a prominent sign directing the patient to use a hand sanitizer from a non-touch dispenser stand and to vigorously rub their hands for 20 seconds.
    • Anyone who is coughing should be given a mask and be asked to seek medical help.
    • Take the patient’s temperature, anyone with a fever should be given a mask and be asked to seek medical help.
    • While this is an imposition on the staff and the patient, all will appreciate your concern for their collective welfare.

It is important to stress that, even with all these precautions, an infected patient might still slip through. It is therefore important to take every possible precaution to protect oneself.

Engineer Controls

The hope is to be able to optimize ventilation in the operatory. Ideally, air exchange of the operatory 6 times an hour during operating hours would reduce issues with undue exposure.

This may not be practical in your given set of circumstances, but the ventilation system should be optimized as much as possible.

Environmental Hygiene

Because the coronavirus can stay alive on surfaces for more than 24 hours, it is important to keep all surfaces clean and sanitized. While this pertains to the waiting room, the bathroom, all common areas, and the front desk, it is particularly important to disinfect the operatory as frequently as is feasible.

Common cleaners such as 0.1% sodium hypochlorite, 0.5% hydrogen peroxide or 62-71% ethanol have all been shown to be effective.

Correct Work Practices

Special attention should be paid to good hand hygiene:

  • Good hand hygiene is the most important protection for the dentist and the staff:
    • Thorough hand washing with soap and water
    • Lather hands with soap
    • Lather the back of hands, between the fingers and under the nails
    • Scrub hands for at least 20 seconds
    • Rinse off
    • Dry hands with a clean disposable towel or air dry
  • Try to minimize aerosol effects using a rubber dam and high-speed suction; consider oral rinsing prior to treatment and disinfect surfaces.
  • Pay even more meticulous attention to:
    • Sharps safety
    • Injection safety
    • Waste disposal
    • Sterile instruments and devices

Personal Protective Equipment

Dental Professional and Staff

Dental professionals are used to working with a mask, gown, and gloves. Because the coronavirus is a virus that can be aerosolized with procedures, conventional surgical masks are not adequate. Depending upon the potential exposure, the dental professional and staff should consider:

  • N95 Mask/Respirator
    • Ordinary surgical masks have pores of about 2-10 microns, while the N95 has pores of about 0.3 microns
    • The coronavirus is about 0.12 microns in diameter
  • Face shield protection (welder-style shield) if aerosolization is expected
  • Goggles
  • Gown
  • Gloves
  • Do not touch your face
  • Be particularly careful not to touch your face when taking masks and shields off

Front Desk Staff

  • Front desk staff should also have masks on hand for their protection.
  • A barrier should be established between the patient and front desk staff.
  • Understand office policies and procedures regarding staff health issues. Know your leave time policy for staff members who may have a medically compromising condition.
  • Stay at least 6 feet away from symptomatic patients.

CDC Universal Precautions

Full contact and respiratory precautions should be in place, including the deployment of:

  • Gowns
  • Gloves
  • N95 masks/respirators
  • Goggles
  • Face Shields
  • Hand hygiene
  • Sharps safety
  • Injection Safety

The recommendations outlined here are obviously subject to change as the clinical scenario evolves. However, they are certainly reasonable cornerstones to help dental professionals navigate these troubled times.

Good luck and take good care of yourself and your patients.

Dr. Leslie Shu-Tung Fang is the John R. Gallagher III and Katherine A. Gallagher Endowed Chair in Clinical Excellence at Massachusetts General Hospital and Harvard Medical School.

He is a world-renowned physician, educator, businessman and speaker. He received his PhD in Physiology and Biophysics from the University of Illinois and his Doctorate of Medicine from Harvard Medical School. He is board certified in both Nephrology and Internal Medicine and has been repeatedly honored as one of “America’s Top Doctors” and “The Best Doctors of Boston.”


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