Most of the pediatricians and pediatric dentists in the Houston area continued to prescribe fluoride supplements, even though these supplements should not be prescribed when the water is fluoridated. Some of them test the water and some don't. The total amount of fluoride in an infant's diet comes from a variety of sources. Baby foods which contain meat products sometimes have a high level of fluoride because bone particles are included. Baby foods which are made with fluoridated water, either at home or in a distant factory, are thought to contain the same concentration of fluoride as the water they are made with, but sometimes contain more because boiling water during food preparation concentrates the fluoride content.
Some families prefer to use bottled water for food preparation at home.
The fluoride content of bottled water varies widely. It is not possible to standardize the amount of fluoride in foods. Because of the widespread consumption of beverages, measuring the fluoride content of the water supply is not really going to show how much fluoride any one person is really getting. From a variety of sources, fluoride in the food chain, whether intentionally added or not, has significantly increased since the 1940's. The total amount of fluoride in any individual's diet is so uncontrolled that it is essentially random.