The human mouth is an extremely diverse microbiome, second only to the gut. Our oral cavity harbors over 700 species of bacteria, fungi, protozoa, archaea, and viruses. Some specimens are common to all humans. These are the core microbiome. Other bacteria and microscopic life are environmentally dependent, only appearing in populations based around their diet, climate, and lifestyle. These make up the variable microbiome. This plethora of teeming life is essential to kickstarting the digestive process, as saliva works with organisms to begin the process of breaking down food. But among these necessary and helpful bacteria are illness-causing microorganisms that can wreak havoc on the body. Under normal circumstances, the immune system is able to repel any harmful pathogens that get into the body through the blood-mucal barrier of the mouth, whether through cuts and scrapes, or even simple brushing and flossing. But there are conditions, or situations, where the body is ill-equipped and vulnerable to an influx of these bacteria. People who are immunocompromised, who have had cardiac bypass surgery, or joint replacement surgery are among those for whom the American Dental Association® (ADA) recommends an extra line of defense. Most often, these protections take the form of antibiotic prophylaxis.
Antibiotic prophylaxis is the procedure of prescribing antibiotics to prevent bacterial infection. Dosages are usually administered 1 hour – 30 minutes prior to any invasive dental treatment. Invasive procedures include even simple treatments like a standard cleaning and polish, alongside major procedures like oral surgery. The prescription is usually broad, covering the largest range of microorganisms and short-lived, wearing off 7–8 hours after ingestion. These antibiotics prime the immune system’s defense prior to bacterial exposure, protecting the body against infection and disease.
Antibiotic prophylaxis is uncommon, serving a small group of people dependent upon age, health risks, and surgery status. This treatment serves the immunocompromised and elderly well, as it bolsters weakened immune defenses. Antibiotic courses are also often prescribed following a cardiac bypass surgery or joint replacement. This is because the manipulation and insertion of a foreign body creates a space of vulnerability; bacteria from the mouth have been known in uncommon instances to travel through the bloodstream to the affected area, causing complications.
Because of this increased pathogen exposure, dental cleaning procedures after major replacement or bypass surgery can be extremely dangerous. Once in your bloodstream, through minor forces like brushing or scaling, oral pathogens can attach and attack these areas, leaving the patient susceptible to serious complications, such as implant failure, muscle and bone damage, and the possibility of sepsis.
Much of the newer scholarship online suggests a radical reframing of antibiotic prophylaxis practice. This idea is reflective of a larger movement within medicine away from the constant prescription of antibiotics, for fear of creating antibiotic-resistant bacteria or minimizing specific antibiotic efficacy in each patient. While this is certainly something to discuss with your surgeon and primary care physicians, here at Westtown Dental Care we recommend you follow the recommended practices of your specific surgeon. These can vary between doctors, but we advise letting them take the lead on safeguarding you and your health.
If you are immunocompromised or plan to undergo major replacement surgery in the near future, please let our practice know as soon as possible. To ensure your health, we send same-day reminders to take your recommended antibiotic prophylaxis and ensure that you have prior to starting any treatment. Without knowledge of your holistic health situation, we cannot fully confirm your care. As always, if you ever have any questions or concerns, please do not hesitate to call us at 484-887-0777.
Works Cited
“Antibiotic Prophylaxis Prior to Dental Procedures.” American Dental Association, February 19 2026.
Brzak, Bozana Loncar, et al. “Antibiotic Prophylaxis Prior to Dental Procedures.” Dentistry Journal, November 15 2024.
Deo, Priya Nimish and Revati Deshmukh. “Oral microbiomes: Unveiling the fundamentals.” Journal of Oral and Maxillofacial Pathology, January – April 2019, pp. 122-128.
“If I have had a joint replacement, do I need antibiotics before dental procedures?” Mitchell Dentistry, May 25.
“Joint replacement: Joint replacement and Dental Antibiotic Prophylaxis.” American Dental Association.