FIELD: personal use articles.SUBSTANCE: group of inventions relates to medical equipment, in particular to hygienics, and can be used for cleaning teeth. Electric toothbrush contains a brush, a drive means to put the brush in motion, a means of determining the position to determine the position of the brush based on the output signal of multi-axis acceleration sensor, a means of calculating the area to determine the site be cleaned from a variety of areas, obtained by dividing the surface of the tooth row, on the basis of determined position a means of measuring the duration of cleaning for measurement cleaning duration of each section calculating output means for calculating and output of result of cleaning for each area based on the measured duration of cleaning, and a means of calculating the angle of the brush inclination to determine the angle of the brush inclination, which is the angle of the brush inclination relative to the tooth axis, based on the determined position. The calculating output means additionally evaluates and displays the result of cleaning for each site based on a comparison obtained as a result of calculation of angle of brush inclination with a given optimal value of this angle. The group of inventions includes a second embodiment of an electric toothbrush.EFFECT: provision of appropriate use of an electric toothbrush and correct tooth brushing.18 cl, 35 dwgГруппа изобретений относится к области медицинской техники, в частности гигиены, и может быть использована для чистки зубов. Электрическая зубная щетка содержит щетку приводное средство для приведения щетки в движение средство определения положения для определения положения щетки на основании выходного сигнала многокоординатного датчика ускорения средство вычисления участка для определения очищаемого участка из множества участков, полученных путем деления поверхности зубного ряда, на основании определяемого положения средство измерения продолжительности чистки для измерения продолжитель
