I was just reading through some articles and came across one about flouride in water. It's from last year, but still interesting for those of you who didn't already know. If you use formula you should not be mixing it with tap water if it is fluoridated (boiling or filtering water does NOT remove fluoride). Here's the article: https://articles.mercola.com/sites/articles/archive/2010/11/13/cdc-and-ada-now-advise-to-avoid-using-fluoride.aspx You can find out for sure if your water is fluoridated by calling your water company. Your health visitor might also know, they usually have to so they can advise what type of toothpaste to use.