Provided are a toothbrush module, a toothbrush attachment, a brushing assistance system, a brushing evaluation system, a brushing assistance device, and a brushing assistance program that ease obtainment of a brushing action of a user even during brushing. A toothbrush attachment (2) includes: a sensor unit (21) that detects a predetermined physical quantity； a wireless transmission unit (22) that transmits a radio signal indicating the physical quantity detected by the sensor unit (21)； a housing unit (201) that houses the sensor unit (21) and the wireless transmission unit (22)； and a coupling mechanism (202) that removably attaches the housing unit (201) to a toothbrush (4). A wireless terminal device (3) includes a wireless receiver (31) that receives a radio signal and obtains the physical quantity, a music output unit (354) that outputs an image or sound so as to support brushing by a user with the toothbrush (4) based on the physical quantity, a figure display control unit (363), and a notification unit (373).
