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The following strategies may help to whiten teeth:
DIY and Other At-Home Teeth Whitening Methods
Everyone wants to enjoy beautiful, white teeth, but it's essential to avoid methods that could be damaging to your tooth enamel. Many home remedies for tooth whitening exist, and some of them are safer and more effective than others. If you're wondering how to whiten your teeth without damaging them, consider the following options:

Baking Soda: While some argue baking soda is too abrasive to use on your teeth, dental researchers have found it has a rating of seven on the Relative Dentin Abrasivity (RDA) scale of 0 to 269. The RDA level tells you how hard (or abrasive) a substance is on your teeth. As long as you brush softly, baking soda can help gently remove stains from the surface of your teeth.

Whitening Strips: These home tooth-bleaching products mold to the shape of your teeth to whiten natural teeth. White teeth whitening strips its seal of approval in showing safety and efficacy in natural whitening teeth efficacy. It’s the first product in this category to receive the ADA’s seal of approval.

Whitening Toothpaste: Because they contain low concentrations of carbamide peroxide or hydrogen peroxide, whitening toothpaste can lighten tooth shades, but typically only about one or two shades. In their effort to reduce tough stains, whitening toothpaste can be abrasive, resulting in enamel erosion and dentin exposure over time. Whitening toothpaste typically does not contain bleach.
While there is no way to prevent dental discoloration altogether, as it's a part of aging, your diet plays a significant role in how white your teeth look. These naturally teeth-whitening foods may help you to hold on to your bright, white smile and prevent stains:

Broccoli, Cauliflower and Other Coarse Vegetables: These foods are high in fiber and require a good amount of chewing. The longer you chew, the more saliva you will produce to break down stains on your teeth. The fiber-rich vegetables can also help scrape away superficial stains.

Pineapple: This exotic food is the only natural source of bromelain, an anti-inflammatory and cleaning compound found to effectively remove surface stains from teeth, according to a study published in theInternational Journal of Dental Hygiene.
Tips for Keeping Your Teeth White
Along with eating the right foods, it matters when you eat them. To combat the staining effects of pasta sauce, for example, eat a salad first. Spinach and lettuce can create a temporary protective barrier on your teeth to guard against staining. Snacking on dairy, celery or nuts after drinking coffee or eating a stain-causing food can also help clean your teeth and prevent surface discoloration.

And of course, good oral hygiene is essential. No diet or home remedies are a substitute for regular brushing and flossing to remove plaque and cavity-causing bacteria from your mouth. Brush or rinse your mouth right after you’ve finished eating a stain-causing food or drink. You can also use a whitening toothpaste at least once or twice a week to prevent normal yellowing and surface stains.