The present invention relates to a handheld laser device (1) for medical, in particular dental treatment purposes, comprising a handpiece having a handpiece body (10) accommodating a laser and a removable handpiece attachment (30). The handpiece attachment (30) is slidable over at least a major portion of the handpiece body (10) and the device is adapted such that air and/or water can be supplied from the handpiece body (10) to the handpiece attachment (30).
