Decent for the price. You do the work. 3-5 seconds in hot water (as stated) caused the first one to shrink straight into a small rubber ball with no way of escaping. I was more careful with the second one and it seems that even if you heat it to the point where it becomes flexible, it still doesn't "form" or "mold" fully. Even after reheating and reshaping. However, I use them constantly with Dr. Song Whitening Gel and it seems to be working fine. B+
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