Products Use: Before the treatment operation, the dentist puts the mouthpiece on both sides of the patient's lips to keep the mouth open and reduce the fatigue caused by the patient's mouth opening. At the same time, the tongue block can effectively limit the movement of the tongue. The suction port below it is just the low point of the sublingual area, so that the saliva in the mouth can be absorbed to the greatest extent, effectively preventing moisture, thus creating a relatively dry operation link for the doctor