Gargling with tea is being tested as a treatment for reducing the build-up of plaque on teeth. A trial in India will compare green and black tea with an antiseptic mouthwash.

Around 45 people with gingivitis – a form of gum disease – will be given one of the teas or a mouthwash containing chlorhexidine to rinse with for 30 seconds, twice a day after brushing.

The levels of plaque on their teeth will be measured throughout the two-week trial at Sri Hasanamba Dental College and Hospital in India.

Plaque forms when we eat and drink – some bacteria in plaque are harmful and, if left to build up, can lead to gum disease.

It’s thought tannin, a chemical in tea, may have antibacterial properties.