Does somebody knows the function of the different kinds of mouthpieces ? Do you use 1 piece for the upper teeth or 2 different ones for upper/lower teeth or one that protects both(the one with a small hole , by which you can try to breathe) . Someone told me to use only a mouthpiece for the upper teeth because its only function is to avoid the teeth hitting each other ?????
Thanks for your answers
Thanks for your answers
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