To easily grasp the most suitable tooth polishing pressure to prevent tooth quality and organization around tooth from damages while habitually polishing tooth with the most suitable tooth polishing pressure and further elongating the life of a brush part and bristle tip of a toothbrush.

A toothbrush 1 with a tooth polishing pressure detecting/ alarming function polishes teeth with a tooth polishing brush part 4 provided in a tooth brush body 3, and has a tooth polishing pressure detecting means for detecting the contact condition of the brush part 4 with tooth at pressure higher than a predetermined pressure and comprising a pressure regulating part 9 such as a hard rubber or coiled spring built in the toothbrush body and a buzzer 14 of an alarming means switched on to alarm on the basis of the detection of the contact condition of the brush part 4 with the tooth at the pressure higher than the predetermined pressure from the tooth polishing pressure detecting means.