Why is toothpaste important you ask?
Well, brushing with toothpaste is important for several reasons:
First- Toothpaste and a correct brushing technique work to remove plaque, a sticky, harmful film of bacteria that grows on your teeth that causes cavities, gum disease and eventual tooth loss if not controlled.
Second- Toothpaste contains fluoride, which makes the entire tooth structure more resistant to decay and promotes remineralization, which aids in repairing early decay before the damage can even be seen.
Third- Special ingredients in toothpaste help to clean and polish the teeth and remove stains over time.
Fourth- Toothpastes help freshen breath and leave your mouth with a clean feeling.
You can find more information about toothpaste from http://www.ada.org/en/science-research/ada-seal-of-acceptance/product-category-information/toothpaste.