High Quality Content by WIKIPEDIA articles! Sonicare is an electric toothbrush manufactured by Philips. The brush head vibrates at hundreds of times per second, with the latest models at 31,000 strokes per minute. Rather than connecting to its charger with conductors, it utilizes inductive charging—the charger includes the primary winding of the voltage-reducing transformer and the fat handle of the brush includes the secondary winding. The magnetic field is not shorted out by spilled liquids around the sink, as an electric field would be. The replaceable head is also driven magnetically. In 1987, David Giuliani, an entrepreneur with a background in electrical engineering, met with University of Washington professors Drs. David Engel and Roy Martin. They formed a new company named GEMTech to promote a dental hygiene device using a piezoelectric multimorph transducer. After several years of research and creating prototypes, the Sonicare toothbrush was introduced in November 1992 at a periodontal convention in Florida.

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