I would like to point out Wales does not put it the water,

“The recent Water Act 2003 has changed the decision-making process regarding whether fluoridation of water supplies should take place. Historically, Health Authorities have only been able to request fluoridation and the water companies have been able to agree or refuse the request.”

Quote from Dwr cymru
“Dŵr Cymru Welsh Water do not fluoridate any of our water supplies and we have not received any indication that the National Assembly for Wales intend to ask us to fluoridate any water supplies.”