CREWE, Nantwich and Alsager are the only towns in Cheshire to have fluoride added to drinking water.
A United Utilities spokesman confirmed the three places and the rural areas of Bickerton, Bulkeley and Burland, Wrenbury Egerton Green and Faddiley are served by the Hurleston Water Treatment Works.
Sandbach is not on a fluoridated supply.
The North West Strategic Health Authority is the body that would decide whether to expand fluoridation – which would require widespread public consultation.
Yvonne Dailey, a consultant for dental public health said: “Fluoridation is one possible intervention to improve dental health but there is a lot to consider. We’ll continue to review the evidence but suggest the public can improve their dental health by restricting sugary snacks and drinks to mealtimes only, using a family fluoride toothpaste twice a day, and spitting out the excess, rather than rinsing.”
Fluoridation of water is in the news after a Southampton resident launched legal action to stop it.
The resident lodged an appeal against the 2009 decision by the South Central Strategic Health Authority to fluoridate supply in Southampton.