Provided is a dental dust prevention bag that is easy to carry, and easy to prepare when used. A dental dust prevention bag (10) is formed into a bag shape, and comprises, as parts constituting the bag shape, a bottom part (11), a back part (12) disposed at one end of the bottom part, a top part (13) disposed to extend from an end of the back part on the opposite side to the side where the bottom part is disposed to the other end of the bottom part, and provided with a member having light transmittivity in at least a portion thereof, and a side part (14) disposed so as to close an opening portion surrounded by the bottom part, the back part, and the top part. An insertion port (14a) by which the inside and outside of the bag shape communicate with each other is provided in the side part, the bottom part, the back part, the top part, and the side part are connected while the detachment thereof is restricted, and at least one of the bottom part, the back part, the top part, and the side part has flexibility so as to be foldable at an arbitrarily defined position such that the bottom part and the top part overlap each other.
