of the brush base 8 and forms a brush 9 as can be seen in fig2 when turning on the power source 7 exciting energy is supplied through the power supply cord 6 to the semiconductor laser 5 so that a laser beam in the form of a continuation wave or a pulse wave is emitted from the semiconductor laser 5 this laser beam is transformed while travelling through the cone shaped connecter 3 and as a result enters each narrow fiber 1 that constitutes the narrow fiber bundle 2 as the light travels through each fiber 1 it is continually reflected inside the fiber 1 due to the surrounding metal layer therefore light is conveyed to the brush 9 and emitted at the tip thereof the laser beam is transferred to the narrow fiber bundle 2 without loss because the cone shaped connecter 3 is firmly placed between the semiconductor laser 5 and the bundle 2 thus loss is eliminated because no light can escape the structure the apparatus according to this invention is used in the same manner one would use a normal toothbrush an operator handles the brush base s to manipulate the brush 9 into the mouth and then brushes his teeth and gums keeping the brush tips 9 and thus the emitted light directed towards the teeth and gums since the brush 9 comprises many narrow fibers 1 a large area of the mouth can be treated with the emitted light at one time thus pain and inflammation can be efficiently.