As a natural remedies to clean and whiten teeth, Siwak was in the top spot. Wood Siwak (Salvadora persica) has been used for centuries as a toothbrush because it contains fluoride and naturally antibacterial. Siwak even shown in some studies more effectively prevent plaque and gingivitis than toothpaste. A study limited to 24 people, average age 23 years showed that the use of siwak 4 times a day for a month able significantly whiten teeth.
"Chrispy" Fruits like apple, guava, pear have the abrasiveness that can help to remove stains and clean the teeth. They're like nature's toothbrush that cleans teeth surface without damaging the teeth enamel.
Certain foods such as carrots, celery and apples increase saliva production in your mouth while chewing. Saliva is the body's natural stain remover. However, saliva works both ways. Besides cleaning up food scraps and garbage, saliva also carry bacteria into the mouth, which means brushing your teeth twice a day, and limiting consumption of sugar is just as important.
Other foods can be used to work directly on the stain teeth. Strawberries contain malic acid, which is also contained in toothpaste whitening. You can divide strawberries and rubbing them on your teeth to clean stains. Another alternative to whiten teeth, you can gargle with lemon juice twice a week or brush your teeth with a washcloth soaked in olive oil for a few minutes.
Keep in mind that naturally teeth have a yellowish color because it contains calcium, an essential mineral for strong tooth enamel. Brushing too hard and eating too many acid foods potentialy to damage your teeth.