High-speed toothbrush mobile phone with high-speed dental drill ball bearings speed of up to 400,000 rev / min, with Japan, Germany, Britain, the production of dental drill interchangeable bearings. Under normal conditions of use, bearing clinical service life of not less than six months. High-speed dental drill ball bearing is a kind of precision micro-bearings, which should be used with care, careful operation and careful maintenance, otherwise it will directly affect the performance and life expectancy, bearing installation, the shaft and bearing bore interference The amount should be in the range of 0-2цm best. Shaft deviation should be less than 2цm.