Description:The product has seven parts, namely, retractor, flexible connector, tongue guard, connecting arm, suction tubing, position block, and Y-connector (Detailed structure is in assemble instruction). Before operation, dentïsts need to put the retractors on both sides of patient’s lips to maintain the mouth opening so that patïent will not feel too tired. Meanwhile the tongue guard can effectively restrict the activities of the tongue. The mouth bottom is just below the suction area, which can maximize the absorption of the salïva and prēvent moïsture. This product can create a relatively dry environment for dentïsts. It’s mainly used for orthŌdontïc treatment. Package Included:1*Main Unit1*Manual