First step is to buy activated charcoal, any brand is fine. This is what I found on amazon
Break a capsule in half and use half a capsule to apply to teeth. Brush with your toothbrush or scrub with your finger. You want to get it all over your teeth and mouth as this will also help with bad breath. Yes, it is black but no, it will not stain. It is awesome.
It leaves your teeth feeling extra clean and they will be whiter of course. Activated charcoal is what you will find in all of your store bought whitening stripes you pay loads of money for. Activated charcoal is the ingredient that removes staining form coffee, teas and cigarettes. This will work better, cost less, and is all natural. It wont have any extra chemicals that are found in your store bought strips.
