Now here is where things get interesting. Today, a cavity moves in exactly the opposite manner. With the use of fluoride and sealants, the enamel on most teeth is almost impervious to bacterial assault. A cavity can take many years to start and will almost always be small, or nonexistent, in the enamel. But once it breaks into the softer material inside the tooth, it can grow undetected for many years.
Still, the outside of the tooth looks perfectly fine.
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