So the UK government is allowing the local health authorities to force the water companies to add fluorine to drinking water. In order to prevent tooth decay in children. This is because sadly some parents in the UK are basically incapable / incompetent or both, when it comes to teaching their children to brush their teeth and use mouthwash, whilst letting them eat crap containing large amounts of sugar.
Here is a good Guardian link on the subject.
Another good link is also about the high level of fluorine in tea and the potential risk it poses.
By the way I have been drinking tea since I was a small child, so have ingested plenty of fluorine and I have plenty of fillings.