Unlike a different review I didn't experience any discomfort from wearing this. I used this to hold open my lips before adding a whitening tray. It let me dry my teeth and keep the lips out of the way while I got the tray in. Then I removed this.It should be noted the bridge holding the left and right side needs to arch UP not down to face right otherwise it won't hold the lips right.Easy enough to hand wash. The plastic was burr free and polished. I used the largest size for my mouth being an adult male.
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