Isthere any way i can whiten my teeth so they become pure white without doing them at the dentist with a bunch of chemicals?

No: A dentist has specialized instruments to clean your teeth first. You'll need your teeth properly cleaned first before you can whiten them and if you try it at home, it's generally unsafe. That's why most dentist turn to their colleagues to whiten teeth instead of self-whitening. Safety should not be overlooked. Best of luck.

Depends: The color of your teeth depends on genetics and cleanliness. If you have genetically light teeth and keep them spotless, you may achieve your goal with otc bleaching strips. All bleaching involves chemicals, specifically oxidants, however., whether self or professionally administered. "pure" white is going to be elusive, though. Obviously avoid tea, coffee and dark colored drinks.