The present invention relates to an apparatus for purifying dental water. More specifically, the present invention relates to the apparatus for purifying dental water, the apparatus which suppresses generation of adsorbate attached to the electrodes and enable lifetime of the electrodes to be extended by disposing an insulation sheet located between electrodes of the electrolysis module such that a predetermined gap is maintained between the insulation sheet and the electrodes when purifying dental water by an electrolysis method by using an electrolysis module. The apparatus according to an embodiment of the present invention comprises: an inlet pipe into which the dental water is flown the electrolysis module an electrolyzed water supply pipe a flow rate sensor and a control module. The control module controls the electrolysis module such that polarity of a power source supplied to the electrolysis module is periodically changed. The electrolysis module includes: a case a first electrode which is a long rectangular flat plate formed in a vertical direction, which is formed to have a plurality of grooves thereon, and which is disposed within the case a second electrode which is disposed to be parallel to the first electrode within the case in a state that the second electrode is spaced apart from the first electrode in a predetermined gap, which is a long rectangular flat plate formed in a vertical direction, and which has a plurality of grooves thereon and the insulation sheet which is disposed between the first electrode and the second electrode. The first electrode, the second electrode, and the insulation sheet are disposed within the case such that a predetermined gap is maintained between the first electrode and the insulation sheet, and between the second electrode and the insulation sheet.COPYRIGHT KIPO 2018본 발명은 치과용수 정수장치에 관한 것으로, 보다 상세하게는 전기분해모듈을 이용하여 전기분해 방식에 의하여 치과용수를 정수하되 상기 전기분해모듈의 전극들 사이에 위치하는 절연시트와 상기 전극들 사이에 일정한 유격을 갖도록 배치함으로써 전극에 부착되는 흡착물의 발생을 억제하
