Tea drinkers beware. Too much of the wrong kind can add significantly to the amount of fluoride you consume, with the tea in just four cups supplying up to one-third of the maximum safe daily amount.
In places where people ingest too little fluoride, it is added to water supplies to strengthen tooth enamel and prevent cavities. But some 200 million people worldwide – mainly in hot countries where deep wells are bored into fluoride-rich rocks, and people drink lots of water – take in too much, and as a result are affected by fluorosis, which makes their teeth brittle…
