Only after 1st use, wow!! [SEP] I was very skeptical about the charcoal teeth whitening thing. I decided to try it though... and I was blown away by results. I am an avid coffee drinker and I smoke every once in a while, so my teeth tend to stay yellow unfortunately. It is a TERRIBLE mess in my sink, but its so worth it. This picture was my first try at the charcoal stuff. Instant results. It will leave your gums a little tender, so don't brush vigorously like normal toothpaste. I use the charcoal stuff for 2 minutes, wash it out with water, brush my teeth, then use mouth wash. I'd definitely recommend this to my coworkers and friends. However, if you still drink coffee everyday, the whitening will not stay. If you give up smoking or tinted drinks, you'll fall in love with the long term results.