A cavity between two teeth is called an interproximal cavity. Just like any other cavity, interproximal cavities form when enamel is worn away and bacteria sticks to the tooth and causes decay.
Interproximal decay, 25 years ago, when I was a dental student, was pretty cut and dry. The lesion, noted in a bitewing radiograph, was an indication of a cavity, and it needed to be drilled out and ...
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