Mouthwash for Sensitive Teeth: What to Look For and What to Avoid

Start with the label. Choose an alcohol-free rinse, because alcohol dries the mouth and can sting exposed dentine and irritated gums. Many strong-smelling antiseptic rinses fall in this group and are meant for short courses only.

Two ingredients are useful. Potassium nitrate calms the nerve, as it does in toothpaste. Fluoride strengthens enamel and helps the mineral surface of the tooth recover. Some rinses contain both. Our guide on medicated toothpaste for sensitive teeth explains how these ingredients work.

Avoid whitening rinses and anything that lists peroxide or strong acids while your teeth are sore. They can make sensitivity worse. Choose plain over flavoured when in doubt.

A rinse is the second line. The first is a desensitising toothpaste used twice a day, and the home measures in our sensitive teeth guide matter as much as either. A mouthwash adds a little extra coverage between brushings and reaches areas a brush misses.

Use it at a different time from brushing, for example after lunch or at bedtime, so you do not wash the toothpaste off your teeth. Swish for the time given on the label, spit it out, and do not rinse with water straight afterwards, which dilutes the active ingredient. Do not swallow it.

Mouthwash is not meant for young children, who may swallow it. Follow the label and ask a dentist before giving one to a child.

Sensitivity that is limited to one tooth, lingers after cold, or hurts on biting needs an examination rather than a rinse. A rinse cannot fill a cavity or treat a crack. Persistent soreness, bleeding gums or bad breath alongside sensitivity point to gum problems that also need a dentist.

Dry mouth, often from medicines or mouth breathing, can also make teeth feel more sensitive. A mouthwash with alcohol makes dry mouth worse, which is one more reason to keep to alcohol-free. The sensitive teeth page lists the signs that mean you should not wait.