Bad news for Britain, the home of tea drinkers. Experts at the University of Derby have found that 6/10 British teas contain a level of fluoride that puts our health at risk.

A two-minute brew is all it takes for the level of fluoride in tea to reach a level that causes fluorosis, a disease which creates problems with our teeth, bones and ligaments.

But who is most at risk? Which teas are the biggest culprits? Why does the government put flouride in our water?

At least this is calcium fluoride.