visually whitens teeth in several hours.
Have been using this product for years. Really whitens teeth beautifully. Used to purchase from
my dentist, now buy from ebay at a considerably lower price. Easy to use if you already have the trays or personally made trays from a dentist. Pop tray with opalescence on it onto your teeth and go about your business. Several hours later teeth are visually whiter. I use 15% because 20% was too strong for me,.
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