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Features:
1， Comfortable and flexible plastic. 2， Resistant to high temperature 121℃. 3， Idea for opening the upper and low arch， convenient for operating. 4， Easily avoiding patients fatigue by using mouth prop， make patients enjoy a relaxing treatment. 5， Tongue grad block tongue moving so that no injury would happen during the whole treatment. 6， L， M， S type fit for different people.
