What helps a toothache before you can see a dentist? Not antibiotics

A bad toothache is one of the most common reasons people seek emergency dental care, and the wait for an appointment is when the wrong instinct does the most harm [s1]. The single clearest message from the evidence is what does not work: antibiotics do not relieve the pain of an inflamed tooth nerve [s1]. The measures with the best trial record are ordinary painkillers, used as a bridge — not a cure — because the only thing that resolves the problem is a dentist treating the tooth itself [s1] [s2].

Why antibiotics are the wrong reach

Irreversible pulpitis — inflammation of the pulp, the nerve inside the tooth — causes acute, intense pain, and a significant number of dentists still prescribe antibiotics for it [s1]. A Cochrane review set out to test whether that helps. It found a single low-risk-of-bias trial of 40 participants comparing oral penicillin plus painkillers against a placebo plus painkillers [s1]. Over the seven-day study the pain ratings were almost identical: a median of 6.0 in both the penicillin group (interquartile range 10.5) and the placebo group (IQR 9.5) [s1]. Nor did antibiotics spare people painkillers — the groups took about the same number of ibuprofen tablets, 9.20 (standard deviation 6.02) with penicillin against 9.60 (SD 6.34) with placebo, a mean difference of −0.40 (95% CI −4.23 to 3.43; P = 0.84) [s1]. The reviewers concluded there is insufficient evidence to determine whether antibiotics reduce the pain of irreversible pulpitis at all [s1]. The problem is mechanical — an inflamed, trapped nerve — and a drug aimed at bacteria does not release the pressure. Antibiotics also carry their own risks and drive resistance, which is why reaching for them to numb a toothache is doubly misguided [s1].

What the painkiller evidence points to

If antibiotics are out, what is left is analgesia, and the strongest randomised evidence for dental pain comes from a related setting: the pain after lower wisdom teeth are surgically removed, the model researchers use to compare painkillers head to head [s2]. A Cochrane review of seven studies enrolling 2,241 participants found ibuprofen the more effective single drug [s2]. Comparing the doses most often used in practice, ibuprofen 400 mg beat paracetamol 1,000 mg: the risk ratio for getting at least half your pain relieved at six hours was 1.47 (95% CI 1.28 to 1.69) across five trials, with high-quality evidence [s2]. Combining the two did better still — paracetamol 1,000 mg together with ibuprofen 400 mg gave a risk ratio of 1.77 (95% CI 1.32 to 2.39) for at least 50% of maximum pain relief over six hours, though that came from a single trial and moderate-quality evidence [s2]. Reported side effects — nausea, vomiting, headaches, dizziness — were comparable across the groups [s2].

The limits of that evidence

This is where honesty matters. The painkiller trials measured pain after surgery, not the spontaneous ache of a decaying or infected tooth, so the exact numbers do not transfer one-to-one to a throbbing molar at midnight [s2]. What they establish reliably is a ranking between common analgesics for dental pain, not a promise about any particular toothache [s2]. Doses, interactions and whether these drugs are safe for a given person are individual questions — anyone with liver problems, stomach ulcers, kidney disease or who is pregnant, and anyone giving medicine to a child, has reasons the general ranking may not apply, and this article is not advice on what to take [s2].

What it means

Put together, the evidence draws a clear line. Antibiotics are not a painkiller for toothache and should not be used as one [s1]. Ordinary analgesics, with ibuprofen the better-supported choice and paracetamol a partner rather than a rival, are the reasonable bridge while you arrange care [s2]. But every part of this evidence points back to the same endpoint: the pain of an inflamed or infected tooth comes from a physical problem inside it, and only a dentist — draining, cleaning the root canal, or removing the tooth — resolves the cause [s1]. A painkiller buys time to get there. Warning signs such as facial swelling, fever or difficulty swallowing are reasons to seek urgent care rather than wait it out, because those can signal a spreading infection that ordinary painkillers will not touch [s1].