I only used one of the pens for a few hours before going outside. I haven't whitened my teeth in a long time and was a little embarrassed by the darkness between my bottom front teeth and some yellow near the gums. Formulate and brush only where necessary. It's nice to get right into those cracks. Although my coloring wasn't dramatic, after 10 minutes I saw a significant difference. I used it twice a week for 3 weeks and the spots were gone. I drink coffee, 2 cups about 2 times a day. I have had no gum or tooth sensitivity issues with this product. I have received compliments on how white and healthy my teeth are. I like it because white teeth can represent youth ;) Very welcome and I recommend.
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