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Seems to me that this just says the water used to make the tea has fluoride. And Ireland just has significantly more fluoride than most places.

It's both the water and the fluoride content of the tea leaves, although the tea leaves are the main contributor. The first table in the paper shows this.

Edit: spelling and comprehension corrected; pre-tea morning fog.

Thanks for actually reading, unlike the parent.

> The Republic of Ireland (RoI) is the only European Country with a mandatory national legislation requiring artificial fluoridation of drinking water

So, only a problem in countries that do fluoridation. (I didn't know that that was the case in Ireland. This definitely reduces the chance of me ever moving there.)

Not if you live in New Zealand with naturally low fluoride levels!

The study found that the fluoride already present in the tea leaves was the main source of exposure. Those tea leaves were mostly imported from East Africa, as is the case for many cheap tea bags. Therefore drinking a lot of cheap tea bag tea in New Zealand is potentially not much better.