PROBLEM TO BE SOLVED: To identify which of a replacement brush and a replacement probe is attached to a main body of an electric toothbrush without providing a dedicated detection means. An electric toothbrush has a main body containing a drive motor, a replacement brush attachable to the main body, and a built-in main body that emits excitation light that excites a fluorescent substance contained in dental plaque from an input / output port. , A fluorescence detection module that receives the fluorescence incident from the input / output port, an exchange probe that can be attached to the main body, and guides the excitation light and the fluorescence generated in the teeth irradiated with the excitation light, and the optical path of the excitation light. Which is provided in the fluorescent detection module and makes the received light intensity at the fluorescence detection module different between when the exchange brush is attached and when the exchange probe is attached, and which of the exchange brush and the exchange probe is the main body depending on the light reception result of the fluorescence detection module. And a control unit that detects plaque according to the light reception result of the fluorescence detection module when it is determined that the replacement probe is mounted. [Selection diagram] FIG.【課題】交換ブラシと交換プローブのいずれが電動歯ブラシの本体に装着されているかを専用の検出手段を設けずに識別する。【解決手段】電動歯ブラシは、駆動モータを内蔵する本体と、本体に装着可能な交換ブラシと、本体に内蔵され、歯垢に含まれる蛍光物質を励起する励起光を入出力口から出射するとともに、入出力口から入射した蛍光を受光する蛍光検出モジュールと、本体に装着可能であり、励起光および励起光が照射された歯で生じた蛍光を導波する交換プローブと、励起光の光路上に設けられ、蛍光検出モジュールでの受光強度を交換ブラシの装着時と交換プローブの装着時とで異ならせる識別部材と、蛍光検出モジュールでの受光結果に応じて交換ブラシと交換プローブのいずれが本体に装着されているかの識別を行い、交換プローブが装着されていると判定したときに蛍光検出モジュールでの受光結果に応じて歯垢を検出する制御部とを有する。【選択図】図２
