Amoxicillin is the most commonly prescribed antibiotic for a tooth infection. The standard adult dose is 500 mg taken every 8 hours for 3 to 7 days, and it works against the mix of bacteria typically responsible for dental abscesses. If amoxicillin isn’t an option, several effective alternatives exist depending on your allergy history and the severity of the infection.
First-Line Options: Amoxicillin and Penicillin VK
Amoxicillin and penicillin VK are the two go-to antibiotics for most dental infections. Both belong to the penicillin family and target the bacteria that cause abscesses, gum infections, and infections that spread into the jawbone or surrounding tissue. Amoxicillin is prescribed more often because it’s absorbed better and can be taken less frequently: 500 mg every 8 hours compared to penicillin VK’s 500 mg every 6 hours.
The typical course runs 3 to 7 days, and the exact duration depends on how your body responds. Your dentist or doctor will usually want to reassess after about 3 days to check whether symptoms are improving. You can generally stop the antibiotic 24 hours after your symptoms fully resolve, though you should confirm this with whoever prescribed it rather than stopping early on your own.
What to Expect After Starting Treatment
Most people start to notice less pain and swelling about 48 to 72 hours after beginning antibiotics. That two- to three-day window can feel long when you’re dealing with a throbbing toothache, so over-the-counter pain relievers like ibuprofen can help bridge the gap. If you don’t see any improvement by day three, contact your prescriber. That’s typically the point where they’ll consider switching you to something stronger.
When the First Antibiotic Doesn’t Work
If amoxicillin or penicillin VK alone isn’t resolving the infection, the next step is usually amoxicillin-clavulanate, which pairs amoxicillin with a second compound that disables the defense mechanism some bacteria use to resist penicillin. The standard dose is 500/125 mg three times a day for 7 days. This broader-spectrum option handles more stubborn infections, particularly when the bacteria involved have developed some resistance to plain amoxicillin.
Alternatives If You’re Allergic to Penicillin
A penicillin allergy rules out both amoxicillin and penicillin VK since they’re in the same drug family. Two main alternatives are used instead:
- Azithromycin: Taken as a higher loading dose of 500 mg on the first day, then 250 mg daily for the next four days. This shorter course makes it convenient, and it’s generally well tolerated.
- Clindamycin: Taken as 300 mg every 6 hours for 3 to 7 days. Clindamycin penetrates bone tissue well, which makes it particularly useful for deeper jaw infections. It’s worth noting that clindamycin carries a higher risk of a gut-related side effect called C. diff, a type of diarrhea caused by disruption to your intestinal bacteria, so it’s typically reserved for situations where other options won’t work.
If neither azithromycin nor clindamycin fully controls the infection on its own, metronidazole (500 mg three times daily for 7 days) can be added on top. Metronidazole is especially effective against anaerobic bacteria, the type that thrives in the low-oxygen environment deep inside an abscess. It’s rarely used alone for dental infections but works well as a complement when the primary antibiotic needs reinforcement.
Children Need Weight-Based Dosing
Kids aren’t simply given smaller adult pills. Their doses are calculated by body weight. Amoxicillin for children is typically prescribed at 20 to 45 mg per kilogram of body weight per day, split into doses every 8 or 12 hours, with a maximum single dose of 500 mg. Azithromycin follows a similar pattern: 10 to 12 mg per kilogram on the first day, then about half that dose daily for the remaining days.
For children with penicillin allergies, azithromycin and cephalexin are common alternatives. Clindamycin is also used in pediatric dentistry at 20 to 30 mg per kilogram per day. Doxycycline is generally reserved for children over 8 years old. A pediatric dentist will choose the right option based on the child’s age, weight, allergy profile, and the type of infection.
Antibiotics Alone Don’t Fix the Problem
This is the part many people don’t realize when searching for which antibiotic to take: antibiotics control the infection, but they don’t eliminate the source. A tooth infection happens because bacteria have reached the inner pulp of the tooth or the surrounding bone, usually through a deep cavity, a crack, or advanced gum disease. Until that source is addressed through a dental procedure (a root canal, extraction, or drainage of an abscess), the infection will almost always come back once you stop the antibiotic.
Think of antibiotics as buying time and reducing the bacterial load so your body, and your dentist, can deal with the underlying problem. Delaying dental treatment while relying on repeated antibiotic courses contributes to antibiotic resistance and leaves you vulnerable to recurrence.
Signs the Infection Is Becoming Dangerous
Most tooth infections stay localized, but in rare cases they can spread to the throat, neck, or bloodstream. Swelling that extends below the jaw, into the floor of the mouth, or around the eye is a red flag. If you develop a fever above 101°F along with a rapid heart rate, rapid breathing, confusion, difficulty swallowing, or trouble breathing, the infection may be progressing toward a life-threatening condition called sepsis. These symptoms warrant an emergency room visit, not a dental office appointment. Dental infections that spread to the airway can become fatal quickly, and IV antibiotics and surgical drainage in a hospital setting are the only appropriate treatment at that stage.