Why do teeth get yellow?
Teeth become less white over time as the mineral structure of your teeth changes and as your enamel becomes more porous. Teeth can also become discolored by smoking, coffee, red wine and even fluoride from tap water. If you’re feeling self-conscious about your teeth, you can use a variety of methods to whiten teeth including whitening toothpaste, trays, strips and pens. If none of these methods work, then you can have your teeth whitened at the dentist’s office.
5 Natural Ways to Whiten Teeth 
1. Baking Soda and Lemon Juice Paste:
Mix several(more than two but not many) teaspoons of baking soda with enough fresh lemon juice (or water) to make a paste. Wipe your teeth and any extra saliva off of them with a paper towel. Put a good amount of paste onto your toothbrush and apply. Leave the paste on for 1 minute, then rinse, so as to avoid the acid effecting enamel. If you are using just water you can leave it on for up to 3 minutes.
2. Holy Basil :
Holy Basil have whitening properties, it also treats gum problems like pyorrhea. Take out few basil leaves and keep them in the sun for few hours, once the leaves become dry, grind them and make it as a powder. Use this as tooth powder or else you can make it as a paste by adding mustard oil in it.
3. Orange Peel :
Rub your teeth with orange peel before going to bed and then in the morning wash your teeth with water. The calcium and vitamin C present in the orange peel will conflict with microorganisms. This makes your teeth whiter and stronger.
4. Banana Peel :
Rub your teeth with ripe banana peel for 5 minutes, as it is rich in potassium helps to make your teeth whiter. Do this twice a day.
5. Strawberries :
Strawberries are rich in vitamin C, which helps to make your teeth whiter. Make a paste by grinding few strawberries, gently rub your teeth using this paste. Do this twice a day for 2 weeks, this will surely helps and vanishes the yellow tinge on your teeth.
