Stop Reaching for Antibiotics on Every Toothache
Updated: 5 hours ago
"75% of emergency doctors get this wrong. Your patient has a toothache, so you give them amoxicillin... right?" - Simon Want the full breakdown? Watch Paul and Simon discuss this article here. Why we're drilling into this one You're in clinic, and you hear the famous line once again: "I just need my antibiotics for my toothache please doc." BUT - unfortunately the best response isn't the most efficient one.
It's because toothache doesn't always mean infection. Most acute pain without facial swelling is inflammation, not bacterial invasion, and it responds to source control and analgesia rather than antibiotics. The clinical question at triage is simple: does this patient have facial swelling, lymphadenopathy, or fever, or just a very angry tooth?
Irreversible pulpitis is the usual culprit: the pulp becomes inflamed and pressurized inside a closed space, and that pressure, not bacteria in the bloodstream, generates the pain. Antibiotics only earn a place once infection breaks out of that space, tracking into the face or neck as cellulitis, or systemic signs appear.
PITFALLS TO KNOW
Watch the floor of the mouth. Bilateral swelling there can mean Ludwig angina, a rapidly progressive cellulitis that threatens the airway and needs immediate referral to the emergency department for intravenous antibiotics.
A 2026 Choosing Wisely Canada piece in the journal Canadian Family Physician turns this into something usable in your clinic. Reassure patients that pain doesn't equal infection; anti-inflammatory care such as cold compresses, saltwater rinses, and avoiding chewing on that side does the real work while they wait for a dentist. Starting this week, reserve the prescription pad for the red flags below, and treat everything else with source control.
And if you need to hand the patient SOMETHING if they insist on a prescription? Choosing Wisely has a printable Rx for tooth pain you can download and hand out.
WHEN ANTIBIOTICS ARE ACTUALLY INDICATED
Facial or neck cellulitis
Lymphadenopathy or fever
Bilateral floor-of-mouth swelling (refer to ED for Ludwig angina)
ANTIBIOTIC CHOICE, IF INDICATED
Amoxicillin or penicillin V first-line, 5 days
Suspected penicillin allergy: run PEN-FAST before switching
Confirmed or high-risk allergy: cefuroxime
Severe delayed reaction or cephalosporin allergy: azithromycin plus metronidazole
Skip clindamycin: C difficile risk 17 times above baseline
Exam tip: This is the kind of detail that could show up on a SAMP (Select-Answer Management Problem). The trap isn't drug choice, it's catching that bilateral floor-of-mouth swelling signals Ludwig angina and sends the patient straight to the emergency department rather than home with a prescription, so don't skim past it under time pressure.
What do attendees say about The Review Course?
"Good way to guide further studying, gives lots to build on on your own, good clinical pearls." The Review Course 2024 Attendee
Register here!
Refrences
Management of acute dental pain in adults. Canadian Family Physician. 2026. https://www.cfp.ca/content/72/6/395 Image credit : Wikimedia Commons
Comments