The best combination, I have achieved my Dentist level Teeth Whitening in a comfort of my home, in just 3 days i saw amazing results. I love the fact that they Enamel safe, i didn't experience any sensitivity. Now i smile in confidence around people. It's also easy or convenient to use the both The Optic White Tooth paste and the Optic White Overnight Whitening Pen. A game changing Products.