Salt :
Salt is one of the fundamental dental cleansing agents that has been used for ages. It helps replenish lost mineral content in the teeth and helps revive their white color.
You can use common salt regularly each morning as a tooth powder instead of toothpaste. Another option is to mix common salt with charcoal and brush your teeth with it regularly.
You can also mix common salt with baking soda and gently rub it on your teeth.
Be extra careful using salt as it can cause damage to your gums and tooth enamel if used roughly.
Lemon :
The bleaching property present in lemons can also help get rid of yellow discoloration. In fact, gargling with lemon juice and scrubbing your teeth with lemon peel is one of the best ways to make your teeth white again.
Mix together a few drops of lemon juice and some salt.
Apply the mixture on the stained teeth and rub the paste vigorously over your teeth and gums. Leave it on for a few minutes and then rinse your mouth thoroughly with water.
Do this twice daily for about two weeks to get rid of tartar and the yellow tinge.
Orange Peel :
Cleaning your teeth with fresh orange peel on a regular basis will reduce the yellow tinge accumulated on your teeth.
Rub orange peel over your teeth every night before going to sleep. The vitamin C and calcium in the orange peel will combat the microorganisms throughout the night.
Do this for a few weeks and you will notice effective results.
If fresh orange peel is not available, you can use dried orange peel powder.
Strawberries :
Strawberries contain a good amount of vitamin C, which helps make your teeth whiter.
Home remedy for yellow teeth
Grind a few strawberries into a paste. Rub the paste on your teeth gently. If done twice daily for a few weeks, the yellow tinge on your teeth will vanish.
Another option is to mix the pulp of one strawberry with one-half teaspoon of baking soda and spread the mixture onto your teeth and let it sit for a few minutes. Rinse out your mouth and brush your teeth with toothpaste to get rid of any residue.
Reference :
http://www.top10homeremedies.com/home-remedies/home-remedies-for-yellow-teeth.html