I followed the instructions very carefully and they were quite detailed. It worked as said. I bought them for whitening. I have to whiten the top and bottom separately as the mouthguards don't fit well in the mouth. A tray is great though and if I needed it for sleeping to avoid chafing it sure would be comfortable and would work for that too. It comes with a nice tray case and two sets of trays which can come in handy if you screw up one or need another for someone else.
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