The present invention provides a dental treatment assisting tool which allows various foreign materials generated when teeth are being polished or plaque is being removed during dental treatment to be easily withdrawn to the outside without having to swallow and also allows breathing through the mouth. Specifically, the dental treatment assisting tool comprises: a base plate (1) having a generally circular shape on plane, having a concave upper side so that saliva or foreign materials can be easily collected to the center thereof, and having an elliptical spatial part (12) formed on one side thereof for a tongue to be seated therein and an air supply pipe (2) which is a soft resin pipe connected to a hole (14) bored in the center of the base plate (1). Accordingly, during the dental treatment, the entire throat may be sealed in a breathable state for a patient. The present invention has the many advantages of being capable of completely preventing the backflow of solid foreign materials to the throat by filtering the same by means of a blocking plate made of a soft material during treatment and ensuring a comfortable and pleasant treatment as nasal breathing through the nose and also oral breathing through the mouth can be freely performed.La présente invention concerne un outil daide au traitement dentaire qui permet que différentes matières étrangères générées lorsque des dents sont polies ou la plaque dentaire est enlevée pendant un traitement dentaire soient aisément retirées à lextérieur sans devoir avaler et permet en outre de respirer par la bouche. Spécifiquement, loutil daide au traitement dentaire comprend : une plaque de base (1) ayant une forme généralement circulaire sur un plan, ayant un coté supérieur concave de sorte que la salive ou les matières étrangères puissent être aisément collectées au centre de celle-ci, et comportant une partie spatiale elliptique (12) formée sur un côté de celle-ci pour quune langue soit installée dans celle-ci et un tuyau
