Fluorides occur naturally in the earth’s crust, in many materials, in volcanoes and the oceans. The largest natural source in soil and water is from the breakdown of rocks. Most surface waters contain below 1 ppm of fluoride where ground water supplies vary in fluoride concentration. The two most common therapeutic uses of inorganic fluoride are in the prevention of dental caries and the treatment of osteoporosis. It is estimated that 38% of the Canadian population is served by fluoridated public drinking water, as it significantly reduces tooth decay. Inorganic fluoride is also added to products such as toothpaste, tooth powders, mouthwash and vitamin supplements. The main sources of fluoride for most Canadians are: drinking water, drinks and juices, toothpaste and food.
Fluoride is added to some municipal systems to decrease tooth decay. When properly administered, fluoridation is completely safe and is proven to be effective. The recommended level for dental protection varies with temperature but is generally around 0.7 to 1.2 mg/L.
Too much fluoride ingested while teeth are developing, can cause mottling and this occurs in some children at levels of 2.0 mg/litre of water. This is an unnatural level in most water supplies and we have no record of any water sources this high in the North Bay Parry Sound District.
Families with young children, drawing their drinking water from private wells should consider having the water tested for fluoride levels. Like most substances taken in excess, too much fluoride can cause problems, in this case affecting tooth appearance or possibly skeletal health. Conversely, if the fluoride level is too low, it may be advisable to consult your dentist for alternate sources of the mineral.
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