Used once a day for a week and twice a day for several days. No pain or discomfort is a huge plus! I find it helpful to use a gauze or paper towel under my tongue while smiling wide enough to dry my teeth and clean the product with a toothbrush/paste after brushing. A slight difference in the color of the teeth, slightly lighter and only noticeable to me. Will try to update in four weeks or use both handsets.
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