Teeth Whitening Research Paper

What brand of toothpaste whitens your teeth the best?
     Are your teeth yellowed and stained?  Do you wish to have pearly white teeth? There are so many whitening toothpaste options on the shelf, but which one works the best?  What ingredients should you look for in toothpaste?   A tooth is made of many different parts:  the root, the pulp, the dentin, and the gum tissue.  The crown is the top part of the tooth above the gum, and it is covered by the enamel.  Enamel is the hardest substance in your body, almost as hard as a rock.  This enamel can become stained if not taken care of properly.     
     But what toothpaste gets rid of your yellow teeth and makes them the whitest? I chose five different kinds of toothpaste to research and do my experiments with.  Here are the brands I chose and their ingredients:
-Colgate, Baking Soda & Peroxide Whitening: glycerin, hydrated silica, water, sodium bicarbonate, PEG-12, sodium lauryl sulfate, flavor, sodium hydroxide, cellulose gum, carrageenan, sodium saccharin, calcium peroxide, titanium dioxide, FD&C blue no.1, D&C yellow no.10 
-Crest 3D White: water, sorbitol, hydrated silica, disodium pyrophosphate, sodium, lauryl sulfate, flavor, cellulose gum, sodium hydroxide, sodium saccharin, carbomer, xanthan gum, polyethylene, mica, titanium dioxide, blue 1 lake
- Arm and Hammer Advance White, Extreme Whitening: sodium bicarbonate, PEG-8, tetrasodium pyrophosphate, PEG/PPG 116/66 copolymer, sodium carbonate peroxide, silica, sodium saccharin, flavor, water, sodium lauroyl sarcosinate, sodium lauryl sulfate
-Sensodyne, Extra Whitening: water, hydrated silica, sorbitol, glycerin, pentasodium triphosphate, PEG-8, flavor, titanium dioxide, sodium methyl cocoyl taurate, cocamidopropyl betaine, xanthan gum, sodium hydroxide, sodium saccharin, sucralose
-Rembrandt, Deeply White + Peroxide: glycerin, hydrated silica, urea peroxide , aluminum hydroxide, modified food starch, flavor, sodium citrate, propylene...