An electric dental care device with a care head 7 oscillatingly driven about a rotational axis DV powered by a rotating driving shaft 2. After the CDM mixture is mixed while aging, an organic cation crystallization template, R, and at least one alkali metal or alkaline earth metal, M, is added. Each of the micro prisms is provided so that a reflective surface has a bottom side located at substantially 90 degrees with respect to an optical path of a beam from any one of the light sources.