White spots or marks on teeth can be caused by a number of different factors, but are normally as a result of a condition called fluorosis or a process called demineralisation. Fluorosis is the result of too much fluoride whilst the teeth are developing.
This fluoride is a chemical substance found in water, toothpaste and foods.
Demineralisation on the other hand is when the enamel, the very hard outermost layer of the tooth, has been damaged and eroded, essentially taking away the natural protection and minerals found in the tooth.
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