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Antibiotic Uses and Indications for Dentistry SOP
A concise guide to when antibiotics are truly indicated in veterinary dental care.
A concise guide to when antibiotics are truly indicated in veterinary dental care.
In a world where multi–drug resistant (MDR) bacterial infections are increasingly common, it is imperative that we scrutinize the use of antimicrobial drugs (AMDs) and limit them to situations in which they are truly necessary. According to the CDC’s 2019 Antibiotic Resistance Threats Report, there are 2.8 million MDR infections and 35,000 associated deaths annually in the United States.¹ Even more concerning, the WHO estimates approximately 700,000 global deaths each year due to MDR infections—a number projected to reach 10 million annually if practices do not change.² Overuse and misuse of AMDs in both humans and animals contribute significantly to the development of antimicrobial resistant (AMR) bacterial populations. Many pathogens considered major threats to human health by the CDC have zoonotic potential, and the shared use of similar antimicrobial classes in human and veterinary medicine facilitates transmission of resistance between species.
Periodontal disease results from a shift in the oral microflora due to biofilm and plaque accumulation under the gumline, as well as the host’s inflammatory response to that shift. Inflammatory cells and osteoclasts contribute to tissue destruction, leading to periodontal pockets, bone loss, and oral pain. Antibiotics may temporarily reduce clinical signs, but they do not penetrate the protective biofilm in which periodontal pathogens reside, and thus offer only transient relief. They also disrupt the normal symbiotic oral and gastrointestinal microbiota. For these reasons, antibiotics are never a definitive treatment for periodontal disease; instead, a comprehensive oral health assessment and treatment (COHAT) under anesthesia is required. Except in severe oral inflammatory conditions such as osteomyelitis with an open fistula, pre-COHAT treatments should focus on anti-inflammatory and pain-control strategies rather than antibiotics. Even when antibiotics help reduce active infection, they must always be followed by a COHAT, as antibiotics alone cannot resolve the disease. Likewise, endodontic infections causing facial swelling or draining tracts cannot resolve without extraction or root canal therapy.
Concerns about peri-operative bacteremia and postoperative complications—such as extraction-site infection, dehiscence, systemic infection, or endocarditis—often drive the use of peri- or postoperative antibiotics in veterinary dentistry. Although a transient bacteremia occurs during dental scaling, research shows it resolves within one hour,³ and human studies demonstrate it is no more significant than the bacteremia associated with routine tooth brushing, flossing, or chewing.⁴⁻⁶ In a 2021 study, prophylactic antibiotics did not reduce postoperative infection rates in dogs undergoing major oromaxillofacial surgery; instead, anesthesia time was the only significant risk factor.⁷ Limited evidence exists for humans with maxillofacial trauma, but the general consensus is that antibiotics are unnecessary for conservatively treated fractures and should not be continued beyond 24 hours for open fracture repair; longer durations may even increase infection risk.⁸ Postoperative infections in routine dentistry procedures are rare,⁹ pet owners should be counseled that infection is uncommon but possible and educated on signs to monitor.
Historically, prophylactic antibiotics were recommended for patients with orthopedic implants, heart disease, or immunocompromised conditions such as diabetes, autoimmune disorders, HIV/FIV, or those undergoing chemotherapy. However, recent studies show no evidence supporting the use of prophylactic antibiotics in patients with orthopedic implants⁶ or in most forms of heart disease.¹⁰⁻¹² In 2017, the American Dental Association and American Academy of Orthopedic Surgeons jointly stated that prophylactic antibiotics are rarely indicated for patients with orthopedic implants.¹³ A small subset of high-risk cardiac patients—such as those with prosthetic heart valves, repaired or unrepaired cyanotic congenital heart disease, ventricular assist devices, past infective endocarditis, or cardiac transplant recipients—may require a single oral antibiotic dose 30–60 minutes before invasive dental procedures, which significantly reduces infective endocarditis risk.¹⁴,¹⁵ These conditions are extremely rare in animals. Given the risks of antimicrobial resistance and disruption of normal microflora, prophylactic antibiotics generally pose greater risk than benefit in most patients.
Limited data exist for immunocompromised or diabetic veterinary patients. Current recommendations restrict prophylactic antibiotic use to patients with severely uncontrolled diabetes,¹⁶ severe primary immunodeficiency, severe neutropenia, or those receiving high-dose immunosuppressive therapy.¹⁷ Invasive dental surgery should be avoided in chemotherapy and stem cell transplant patients and all dental disease should be addressed prior to starting treatment whenever possible18. In human medicine, dental disease is systematically addressed before orthopedic surgery or chemotherapy initiation—a practice that could be better implemented in veterinary medicine given that 85% of pets over age three have some degree of dental disease.
Because specific veterinary guidelines are limited, decisions regarding antibiotic use can be challenging, and client concerns often lead to unnecessary prescriptions. The current American Veterinary Dental College (AVDC) position statement recommends systemic antibiotics to reduce bacteremia in animals that are immunocompromised, have certain systemic diseases (e.g., subaortic stenosis or severe hepatic/renal disease), or have severe oral infections.¹⁹ However, this statement is broad and does not fully reflect current research or human dental recommendations. Fortunately, the AVMA, AAHA, and AAFP have recently released antimicrobial stewardship resources to guide clinicians. The 2022 AAFP/AAHA Antimicrobial Stewardship Guidelines clearly state that systemic antimicrobials are not indicated for routine dental prophylaxis or after tooth extraction; they are not a substitute for surgical management of periodontitis; and most periapical abscesses resolve with debridement alone.²⁰ Additional studies are emerging that evaluate antimicrobial use in veterinary dentistry and propose evidence-based changes.²¹,²²
Human medicine literature suggests that antibiotics are frequently prescribed because clinicians believe patients expect them,²³ and this phenomenon occurs frequently in veterinary medicine as well. Education is essential: clinicians must explain risks, benefits, and alternatives and make treatment decisions based on science. Responsible antimicrobial stewardship is also a public-health obligation.
When antibiotic therapy is indicated, choosing an appropriate drug regimen is essential. Bacteroides, a common anaerobe and pathogen in periodontal disease, shows significant resistance to clindamycin and occasionally to amoxicillin–clavulanate; metronidazole is generally more effective.²⁴,²⁵ Porphyromonas spp., another common periodontal pathogen in dogs, shows resistance to clindamycin.²⁶ Clindamycin also does not cover Enterococcus or gram-negative aerobes. Amoxicillin–clavulanate provides broad coverage of gram-positive and gram-negative aerobes as well as anaerobes. In high-risk patients requiring infective-endocarditis prophylaxis (rare), a single IV dose of ampicillin (with or without sulbactam) 30–60 minutes before dental surgery is typically sufficient. For active infection, culture and susceptibility testing is ideal to tailor therapy, while recognizing that commensal oral organisms will also be present.
Some oral diseases more complex than periodontal or endodontic disease may require antibiotics. In feline chronic gingivostomatitis (FCGS) and canine chronic ulcerative stomatitis (CCUS), peri- and postoperative antibiotics may be indicated when healthy gingival closure is compromised, disease is extensive, secondary infection is evident (purulent discharge or crusts), or the patient is immunocompromised. However, recent research shows increased AMR in FCGS cats, particularly to amoxicillin–clavulanate, and suggests fungal overgrowth may contribute to disease.²⁷ Therefore, postoperative antibiotics should ideally be limited to 3–5 days to reduce selective pressure. Because FCGS and CCUS are immune-mediated diseases, pain control and immunomodulatory therapy are the mainstay of treatment.²⁸ Pentoxifylline, niacinamide, and doxycycline or metronidazole have recently been described as a treatment regimen for CCUS.²⁹ Additionally, hyaluronic acid (Periovive) is showing promising results in treatment of stomatitis as well as reducing healing times and post operative infections.30,31 More research is needed to identify additional effective therapies for these painful conditions.
Other severe oral diseases, including osteomyelitis and osteonecrosis of the jaw, may warrant longer antibiotic courses. Emerging data show promising outcomes using pentoxifylline and vitamin E following surgery for osteonecrosis.32-34 Osteonecrosis with an open draining fistula, often due to endodontic infection from fractured teeth, may require antibiotics and NSAIDs until surgery can be performed. Some cases may benefit from sedation to lance and flush abscesses to minimize antibiotic needs. For severe osteomyelitis that cannot be fully debrided surgically, 14 days of amoxicillin–clavulanate and/or metronidazole may be necessary and, in rare cases, extended to 6–8 weeks depending on clinical response and repeat imaging. Minimal veterinary research exists regarding antibiotic use for open jaw fractures, but human literature recommends limiting therapy to 24 hours.⁸ Veterinary recommendations often range from 3–7 days. For major maxillofacial surgery, including tumor resection, perioperative antibiotics generally do not reduce postoperative infection rates but may be considered for procedures exceeding six hours.⁷ For most other dental conditions—particularly those without fever—anti-inflammatory medications can adequately control pain and swelling until definitive surgical treatment is performed.
Ultimately, while antibiotics are valuable tools for managing bacterial disease, they must be used judiciously and only when indicated. Periodontal disease is best treated through mechanical removal of plaque and calculus, root planing, endodontic therapy, and/or extraction, allowing the body to resolve remaining inflammation and infection. Prophylactic antibiotic use should be reserved for truly high-risk patients, who are uncommon in veterinary medicine. At Mainely Veterinary Dentistry, we take antimicrobial stewardship seriously; please speak with your technician if you have questions about antibiotic use in your pet.
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