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I soak mine everyother day with efferdent as I'm a tea drinker and I drink lots of it. I can't possibly take the trays out for every tea... I wouldn't get any results.. LOL
So with that said, My trays get stained and the soaking helps them. I only soak them for about 5 to 10 minutes. The trays never got brittle or cracked so I'm happy with that.
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