Baking soda can provide mild, temporary relief from a toothache, but it won’t fix the underlying problem causing your pain. It works primarily by neutralizing the acids in your mouth that irritate exposed or damaged tooth surfaces, and it has a modest antibacterial effect. Think of it as a stopgap measure while you arrange to see a dentist, not a treatment in itself.
How Baking Soda Reduces Tooth Pain
Most toothaches involve bacteria that produce acid as they feed on sugars in your mouth. That acid eats away at enamel, inflames gum tissue, and aggravates any crack, cavity, or exposed nerve. Baking soda (sodium bicarbonate) is a mild alkaline compound that raises the pH in your mouth, effectively neutralizing those acids. A study published in the National Journal of Maxillofacial Surgery found that rinsing with a baking soda solution significantly increased salivary pH to a level sufficient to restrict enamel breakdown.
Beyond pH, baking soda appears to reduce the number and aggressiveness of the bacteria most responsible for tooth decay. Researchers observed a decrease in colony counts of streptococci and other common oral bacteria after baking soda rinses. This doesn’t mean it kills an active infection, but it can calm the acidic, bacteria-heavy environment that makes a toothache feel worse.
What baking soda does not do is numb pain directly. It has no anesthetic properties. If your toothache is caused by a deep cavity, a cracked tooth, or an abscess, baking soda can take the edge off by reducing chemical irritation, but the pain signal from inflamed or dying nerve tissue will still be there.
How to Use It Safely
The most effective approach is a simple rinse. Dissolve 1/4 teaspoon of baking soda and 1/8 teaspoon of salt in one cup of warm water. Swish it gently around the painful area for 30 seconds, then spit. Follow with a rinse of plain water. You can repeat this a few times a day.
Some people make a thick paste by mixing baking soda with a few drops of water and applying it directly to the sore tooth or gum. This delivers a more concentrated dose to one spot. Leave it on for a couple of minutes, then rinse thoroughly. The paste method is fine for occasional use, but avoid leaving concentrated baking soda against your gums for extended periods, as prolonged contact with highly alkaline substances can irritate soft tissue.
Baking soda is one of the least abrasive substances used in dental care. Its hardness is lower than both enamel and dentin, so using it in a rinse or brief paste application poses no meaningful risk of wearing down your teeth.
What Baking Soda Won’t Fix
A toothache is a symptom, not a condition. The cause could be a cavity that has reached the nerve, a cracked tooth, gum disease, or an abscess (a pocket of infection). Baking soda addresses none of these. It changes the chemistry of your saliva temporarily, which can reduce discomfort, but the structural or infectious problem remains.
For stronger short-term pain relief while waiting for a dental appointment, over-the-counter pain relievers like ibuprofen are more effective because they actually reduce inflammation at the source. Topical numbing gels containing benzocaine can dull surface pain around the gum line. Baking soda works through a completely different mechanism and is weaker than either of these options for managing acute pain. You can use a baking soda rinse alongside them without any conflict.
When a Toothache Needs Urgent Care
Certain symptoms mean the problem has moved beyond anything a home remedy can help with. A fever combined with facial swelling suggests a dental abscess has spread. Swelling in your face, cheek, or neck that makes it hard to breathe or swallow is a medical emergency. According to the Mayo Clinic, if you experience these symptoms and cannot reach your dentist, go to an emergency room. Infections from abscessed teeth can spread to the jaw, throat, and neck, and in rare cases become life-threatening.
Other signs that your toothache needs professional attention sooner rather than later include pain that wakes you from sleep, pain that throbs constantly rather than only when you eat, a foul taste in your mouth (suggesting draining pus), or visible swelling along the gum line.
Precautions Worth Knowing
When used as a mouth rinse, baking soda is very safe for most people. The amount you might accidentally swallow from a rinse is trivial. However, deliberately swallowing baking soda in larger amounts carries real risks, particularly if you have high blood pressure or kidney problems. Baking soda is pure sodium, and chronic ingestion has been directly linked to elevated blood pressure. In one documented case, a patient’s long-standing hypertension resolved entirely once he stopped regularly consuming baking soda. His blood pressure rose again during a controlled challenge with oral sodium bicarbonate, confirming the link.
For a rinse you spit out, this is not a concern. Just avoid the temptation to swallow baking soda solutions as a general health remedy, especially if you are managing blood pressure or kidney function.
The Bottom Line on Baking Soda and Toothaches
A baking soda rinse is a reasonable, low-risk way to calm a toothache temporarily. It neutralizes the acids that aggravate exposed or damaged tooth surfaces, and it modestly reduces harmful bacteria. It costs almost nothing and is unlikely to cause harm when used as a rinse. But it provides only partial, temporary relief. If your toothache persists beyond a day or two, or if it comes with swelling, fever, or intense throbbing, the tooth needs professional treatment that no rinse can replace.