A few years ago I ordered something similar from a late night TV commercial. This product came with useless, open, undefined "shells" that you need to use as mounts. My dentist took an impression of my teeth and made correctly fitting flexible plastic caps that hold the gel in place. If you want to buy this product these are the ones you will need so get this one first. Anyway, I don't use it often, but I did again the other day. It's been in my fridge for years and it still works! But my dentist gave me new tubes of bleach for free with every cleaning. Yours can do the same; You may not need it.
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