Out of the set of 4, one small one has been used, so it's not included. You mold it to your teeth by soaking it in hot water. The case and mouthpiece are unused. The box is dirty. The box will be folded and included. For teeth grinding対策 and beauty while sleeping. *Contents* Large mouthpieces x 2 Small mouthpieces x 1 Dedicated case (white) Japanese instruction manual [Beautiful While You Sleep] Easy to use, just put it on before bed. A mouthpiece made for Japanese teeth. [Noise Reduction] The silicone material absorbs pressure on the jaw. Can be used for teeth grinding and noise reduction. [Recommended for those who] Want to use their sleeping time for beauty #KogaoJenne (Small Face Genne) #SleepingMouthpiece #Mouthpiece