Canker Sores: What Actually Works (and When to Worry)

Salt Water, Honey, or Steroids? The Evidence on Canker Sore Treatment

Nearly everyone gets a canker sore at some point — that small, painful crater on the inside of your cheek or lip that makes eating, talking, and even smiling uncomfortable. The good news: most of these minor aphthous ulcers heal on their own within 7–10 days, without scarring.

The better news: a couple of evidence-backed remedies can make that week a lot less miserable.

First-Line Home Care: Salt Water Rinses

For mild symptoms, a simple salt water rinse remains a recommended local measure. It’s inexpensive, has essentially no downside, and can meaningfully ease discomfort while the ulcer runs its natural course.

How to use it: Dissolve about half a teaspoon of salt in a cup of warm water and swish for 30 seconds, several times a day.

The New Contender: Thyme Honey

If your canker sore is more than mildly annoying, recent research points to an unexpected remedy: thyme honey.

A randomized controlled trial of 30 patients compared thyme honey directly against triamcinolone acetonide — the prescription topical steroid that’s long been the go-to treatment. The results were striking: patients using thyme honey saw significantly greater reductions in ulcer size by days 5 and 7, more pain relief on days 3, 5, and 7, and better overall quality-of-life scores after a week. This is the first clinical trial to demonstrate honey’s effectiveness for minor aphthous ulcers, and it outperformed the standard steroid treatment across nearly every measure.

When Prescription Treatment Makes Sense

For ulcers that are genuinely bothersome, topical corticosteroids like triamcinolone acetonide are still the established first-line pharmacological option. A large network meta-analysis pooling 69 randomized controlled trials and 5,272 patients found that topical triamcinolone reduced pain scores by 28.4% and ulcer size by 25.8% compared to placebo. It works — thyme honey has simply shown it can work at least as well, if not better, in early research.

Red Flags: When to See a Professional

Most canker sores are nothing more than a temporary nuisance. But a few situations warrant a closer look:

Ulcers lasting longer than 4 weeks should be biopsied to rule out oral squamous cell carcinoma — especially in people without a history of recurrent canker sores.
New-onset canker sores after age 40 should prompt an evaluation for underlying systemic conditions.
Frequent, recurrent ulcers may be linked to nutritional deficiencies — vitamin B12, folate, or iron — and may warrant blood testing in atypical cases.

The Bottom Line

For most people, a salt water rinse and a little patience are all that’s needed. If the pain is significant, thyme honey is a promising, evidence-supported option worth discussing with a dentist or physician. And if an ulcer overstays its welcome past four weeks, or shows up for the first time after 40, it’s worth getting checked out.