Do you have stained yellow teeth? To get visibly whiter teeth in just two weeks for $4 follow these simple steps. What you will need 1) A toothbrush 2) A bottle of hydrogen peroxide. You can pick this up at any chemist for about $4. Get the 30% one. Method: Step 1) Dip your toothbrush in the bottle of H2O2. Step 2) Brush your teeth for about a minute, rinse (Literal) and repeat twice a day for about 2 weeks. I'm not sure how its works and I don't care that much because I'm not a chemist or a dentist but I have been doing this for about 2 weeks now and my teeth are sparkly white. The dentist told me yesterday that its good to get lots of oxygen in your teeth because the bad bacteria don't like it. I also read somewhere that the professional cleaning kits use a chemical that turns into H2O2 when it comes in contact with the saliva but that was probably just a BHW member trying to sell something. Hope this works for you and enjoy your pearly whites.