This material works very well! Teeth became whiter after the first application. I've convinced friends with yellower teeth to try it and the results are amazing! I use it several times a week and I really like it! As others have said, it's a mess. Tips I found after a few uses: Use it in the shower. You can rinse off your shower when you're done. Make sure you always clean your mouth with your mouth closed. It seems obvious, but it's important. Designate a toothbrush for this. This will turn your brush black no matter how many times you rinse it. - Focus on your front teeth and don't worry about your back teeth like you would with regular toothpaste. No one cares if your molars are white. - Spit in the sink THEN turn on the water. If you spit in running water, black splashes will spurt everywhere. After you spit for the first time, keep brushing. I usually clean until I sleep. Clean carefully. My girlfriend brushed too hard and she got charcoal in her gums, she had a nasty tooth all day. Then use dental floss or mouthwash. This will help remove any small particles between the teeth. Before and after picture after ONE use.
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