Salt Water Gargle: How to Do It, How Often and Does It Work?

01How

How to make a salt water gargle

• Use about half a teaspoon (around 3 g) of salt per 250 ml glass of warm water.
• Stir until the salt dissolves completely.
• Use water that is warm, not hot, to avoid burns.
• Take a mouthful, tip your head back and gargle for 15–30 seconds.
• Spit it out; do not swallow.
• Repeat until the glass is finished.
• Gargle up to three or four times a day.

02Works

How salt water helps

A sore throat usually comes from inflammation of the lining of the throat, often due to a viral infection. Salt water is slightly hypertonic, which may draw fluid out of swollen tissues and reduce discomfort. Gargling also helps loosen mucus, rinse away irritants and keep the throat moist. The effect is temporary but can make swallowing more comfortable, especially before meals or bed. Other home remedies are described in our guide to sore throat remedies.

03Evidence

What the evidence says

High-quality research specifically on salt water gargling for sore throat pain is limited, but it is widely recommended by health services because it is low-risk. A randomised trial of healthy volunteers in Japan, published in the American Journal of Preventive Medicine, found that gargling with plain water three times a day reduced the incidence of upper respiratory tract infections compared with usual care. A small pilot randomised trial in Scotland found that hypertonic saline nasal irrigation and gargling shortened the duration of colds and reduced household transmission. Larger trials are needed.

04Uses

When salt water gargling can help

• Sore throats from colds and other viral infections.
• Postnasal drip and catarrh in the throat.
• Mouth ulcers and minor gum irritation.
• After dental procedures, if your dentist recommends it.
• Tonsil stones, by helping to dislodge debris; see how to remove tonsil stones.
• As a preventive habit during cold and flu season.

05Safety

Who should avoid it

• Young children who cannot gargle and spit reliably (usually under about six years).
• People with swallowing difficulties who might inhale the water.
• Those on strict salt restrictions should avoid swallowing it, although the amount absorbed when spitting is small.
• Stop if it irritates or burns.

06Other

Other ways to soothe a sore throat

• Drink plenty of fluids; warm drinks or cold foods can both help.
• Take paracetamol or ibuprofen if suitable.
• Suck lozenges or ice chips (not for young children).
• Use honey in warm water for adults and children over one year.
• Rest your voice and avoid smoking.
• Use a humidifier or steam to keep the air moist.

07Antibiotics

When you might need more than home remedies

Most sore throats are viral and get better within a week without antibiotics. A doctor may consider testing for strep throat or prescribing antibiotics if you have a high fever, swollen tender glands, pus on the tonsils and no cough, or if symptoms are severe. Salt water gargling can be used alongside medical treatment. Read more in antibiotics for sore throat.

08Variants

Variations people use

• Baking soda: some add a quarter teaspoon of bicarbonate of soda, which may help loosen mucus.
• Honey: adding honey to warm water soothes, but is best swallowed rather than gargled.
• Apple cider vinegar: can irritate and erode tooth enamel; not recommended.
• Antiseptic mouthwashes: some contain alcohol and may sting.

09Cases

Three common situations

• Scratchy throat at the start of a cold: gargle three or four times a day, drink fluids and rest.
• Sore throat with high fever and no cough: gargling may soothe, but see a doctor about strep.
• Recurring tonsil stones: regular salt water gargling can help keep the crypts clean.

10Mistakes

Common mistakes

• Using too much salt, which can sting and dry the throat; half a teaspoon per glass is enough.
• Using very hot water, which can scald the throat.
• Gargling for only a second or two; aim for 15–30 seconds per mouthful.
• Swallowing the solution instead of spitting it out.
• Relying on gargling alone when there are warning signs that need a doctor.
• Giving it to young children who are likely to swallow it.

11Children

Salt water gargle for children

Older children who can gargle and spit safely can use a weaker solution, about a quarter of a teaspoon of salt in a glass of warm water. Supervise them and make sure they spit it out. For younger children, fluids, cold foods, honey for those over one year, and paracetamol or ibuprofen at the correct dose are better options.

12Summary

Key points to remember

• Use about half a teaspoon of salt in a glass of warm water.
• Gargle and spit, up to three or four times a day.
• It soothes symptoms but does not cure infections.
• See a doctor for severe or persistent sore throats.