i have yellowish teeth and i whiten them without giving them much harm.(by a home remedy)
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To keep teeth bright and prevent yellowing, you need to remove the staining bacteria. This is exactly what happens when you chew certain foods that produce a high salivary flow. So, in addition to apples, take a bite out of guavas, pears, celery, carrots, sugar cane, cauliflower, and cucumbers. Another benefit: The fibre in some of these foods physically works to clean teeth and remove bacteria.
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