Testing procedures that led to advent of fluoride treatment in dentistry for prevention of cavities. A boy brushing his teeth. In a laboratory, teeth that had made radioactive at the Oak Ridge National Laboratory, Tennessee, are subjected to mechanical brushing with stannous fluoride. A technician places a tooth in a Petri dish. He drops acid (akin to that produced by the human mouth which causes tooth decay) over the tooth, via a pipette. A woman technician using a Geiger counter, measures the amount of radioactive tooth dissolved by the acid. Experiment showed that the stannous fluoride reduced damage to the tooth caused by the acid.
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