The present invention discloses a dental group Public induction Food Street opening and how it works. Open public groups derived dental Food Street according to the invention , with one end having an opening piece insertion hole and the outer circumferential surface along the induction coil is wound around the bobbin ; Case having a mounting hole into which the bobbin is inserted ; A close-up of an optical sensor mounted on the bobbin to detect the hand of the operator . ; According to the present invention , an operator on / off switch to actuate the necessary optical sensor for sensing the approach of the operator operation in the current control operation to supply a current to the induction coil is made accurate by the ease of operation is increased because this greatly .
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