Dry socket happens when the blood clot protecting the healing socket is lost, leaving bone exposed. The distinguishing feature is timing: it is not the pain you have on the day, it is severe pain that arrives one to five days afterwards, often with a bad taste or smell. Pain that gets worse around day three, rather than better, is the thing to phone about.
The finding this page is built on Dry socket affects 1–5% of routine tooth extractions but upwards of 30% of surgically extracted third molars — and the single best-evidenced way to prevent it is a chlorhexidine rinse used before the extraction and again 24 hours after, which cut the odds to 0.38 across six trials. Twenty-one other candidate preventatives had insufficient evidence to judge.
That comes from a Cochrane review of 49 trials and 6,771 participants, and the chlorhexidine result is graded moderate-certainty — unusually strong for anything in a surgical recovery. Because the benefit scales with baseline risk, the number of people who need to use it to prevent one case falls to about 7 in the high-risk group, which is exactly the group having impacted lower wisdom teeth removed.
Source: Local interventions for the management of alveolar osteitis (dry socket), Cochrane Database of Systematic Reviews (2022), PMID 36156769
Chlorhexidine 0.12% is prescription-only in the United States, so this is something to ask for rather than something to buy. It is worth raising at the pre-operative appointment, particularly if any of the risks below apply to you — and it is the reason this section has nothing to sell you.
Two risk factors are much larger than the rest, and both are worth knowing in the week beforehand rather than afterwards.
Smoking. A systematic review of eleven studies found smokers had more than three times the odds, with a combined incidence of 13.2% in smokers against 3.8% in non-smokers. That is the largest modifiable number on this page. Stopping even for the few days around the operation is worth doing on these figures, and it is a conversation worth having with your surgeon rather than with a website.
The combined contraceptive pill. Pooling fifteen studies covering 1,366 pill users and 2,919 non-users, users were about twice as likely to develop dry socket (RR 1.98, 95% CI 1.42–2.76). The precise part matters: women who were not taking it had the same risk as men. So this is not a difference between the sexes, it is the pill specifically — which makes it worth mentioning to whoever is doing the extraction, because it is easy for nobody to ask.
On antibiotics, which people often expect: Cochrane found prophylaxis may cut infection by around 66% and dry socket by 34%, but both on low-certainty evidence, and about 19 healthy people need treating to prevent one infection. That ratio, plus antibiotic resistance, is why they are not handed out routinely, and why not being given them is not a sign of being short-changed.
