It's variable: Cavities begin when the decay process penetrates the insensitive enamel and enters the sensitive tooth structure underneath it (this structure is called dentin). The process by which the decay penetrates the enamel varies with: diet, hygiene (brushing, flossing, etc.) genetics (the density of the enamel and dentin), use of anti-cavity substances (fluoride), etc. It will vary.
Answered 6/15/2014
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