Milk can actually yellow teeth slightly if you don't brush them right after drinking cause stuff grows better with whats in milk, and I use foaming toothpaste, it kills everything, and I have mouthwash which is like swishing rubbing alchohal in my mouth.
Brush with baking soda and follow with fluoride mouth wash, 2-3 times a week, using a soft or worn brush, since the baking soda will cause your normal brush to wear out faster than normal and baking soda can be harsh on your teeth when used with too firm a brush or done too often. You should begin to notice difference in a few weeks-less than a month. If you can find a way to make baking soda taste good you win the prize.
Drink milk, brush often. Don't eat a lot of oranges, drink wine, strawberries. Those get rid of enamel that keep your teeth white. Try using ProNamel. It lets you eat what you want without losing the whiteness of your teeth. http://www.pronamel.ca/
Make sure to brush and floss your teeth at least twice a day. Make sure to floss at bedtime and use a cheap gum massage to get under the gum flap. You want to prevent the buildup of plaque, which can discolor your teeth. Focusing on your teeth will help you prevent some staining of your teeth.
As crazy as it sounds, this one simple home remedy can really whiten teeth (and help with gum disease) and is also very effective against food poisoning and other types of internal toxins. Use Activated charcoal it really work.
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Every night in after brushing my teeth, with gauze with some lemon juice, friction teeth, the tooth will become white and bright. Lemon abluent power is strong, and a white effect, and contains vitamin C, can strong root.