Whitening kits that feature upper and lower mouth trays are a favorite here. While they can cause sensitivity for some consumers, they offer the most reliable way of ensuring that your teeth are in contact with the whitening gel-the best way to get visible results. Some kits offer one-size only mouth trays, some offer trays that let you mold them at home, others let you order custom trays for maximum personalization. What kind of tray are you looking for? Take a look at what our readers recommend.
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