Eat more crunchy fruits and vegetables. A big part of keeping your teeth clean involves eating the right foods.[23][24][25][26] Naturally crunchy foods contain fiber, which helps increase saliva production in your mouth, removing many of the sugars and chemicals that can cause tooth decay. About 20 minutes after you eat something, your saliva begins to reduce the effects of the acids and enzymes attacking your teeth. Additionally, saliva contains traces of calcium and phosphate, which can also restore minerals to areas of teeth that have lost them from the bacterial acids.
Make a solution of 1 part ACV and 2 parts water. Swish this around in your mouth for 2-3 minutes, then spit it out. Rinse and brush as usual. ACV has strong fruit acids which can help whiten teeth, but only use this once a week. If you make your own apple cider vinegar, you may want to dilute it even more, like 1:10, since homemade ACV is usually very strong.

The baking soda works on the enamel of the teeth to lift away the staining while the citric acid in the lemon juice provides a natural bleaching action. You can make a baking soda paste by adding some water to it, and use on your toothbrush, or you can blend the baking soda with your toothpaste. Step1 Mix baking soda and the juice from a fresh squeezed lime, you want to use enough lime juice to bring the baking soda to the consistency of a paste. You can use baking soda, instead of salt, to make it more effective. Different theories exist on the benefits of adding lemon juice or strawberries to baking soda for teeth whitening. All you have to do is take a little of baking soda and make a paste by mixing it with some water and a dash of salt.

Ask your dentist about teeth whitening options. Your dentist can help you find the right whitening product or procedure to help you get a brighter smile.[35] Whiteners may not correct all types of discoloration, especially if you have brown or gray hued teeth. If you have had bonding or tooth-colored fillings placed in your front teeth, the whitener will not affect the color of these materials, and they will stand out in your newly whitened smile. You may want to investigate other options, like porcelain veneers or dental bonding. Some other ways to get a whiter smile are:

You can also try a few home remedies to whiten your teeth, though not all dentists recommend them. Brushing the teeth with baking soda can produce slightly lighter shades. You can also brush with no greater than 10% strength hydrogen peroxide. For drug store methods, gel kits are thought most effective, and brush on teeth whitener the least. However, with minimal tooth yellowing, over the counter remedies are less expensive than dental whitening, and may provide you with the lighter shade you desire.
The reason oil pulling works to help whiten teeth is similar to what oil is doing in your car’s engine.  Think about it.  When the oil in your car is changed, the clean oil going in is, well, clean.  And the used oil that leaves your car is all gunky.  That gunk is any waste from the engine running being gathered up and removed from the engine by the oil.

I grew up using Crest with fluoride, brushing within 5 minutes after finishing a meal… (I’ve only ever had three cavities, one of which the dentist gave me when he jabbed his pick into a molar.) After about 30-35 years my teeth began to get really sensitive, so I switched to the various sensitive toothpastes, again with fluoride. About two years ago (I’m almost 59 now), I began reading about fluoride’s effects on teeth and the body, including how FLUORIDE STAINS TEETH YELLOW/BROWN. So I switched to Tom’s no-fluoride toothpaste. I don’t know if it’s just wishful thinking, or an actuality, but I believe my teeth are getting whiter – and I still drink a quart of hot regular black tea (4 teabags’ worth in a Mason jar) every morning! There’s natural fluoride in the tea, but cutting out the fluoride toothpaste has made a world of difference AND my teeth aren’t sensitive anymore, either! I think the sensitivity was also brought on by all that fluoride! Any time I tried to switch off the sensitive pastes to a regular toothpaste, or even between brands of the sensitive types, the inner lining of my mouth would slough off in sheets (as in peeling skin after a bad sunburn), my teeth would just throb, and I’d go back to the sensitive paste. When I went to the Tom’s, my mouth lining was fine, my teeth never hurt, and they seem to be getting whiter! HOORAY!!!
First, I’m sorry if the article was confusing on this aspect of it. With this part of the article on activated charcoal, we were simply expressing our personal concerns about the potential risks of daily use of activated charcoal. You see, warnings exist against using activated charcoal internally daily because it can inhibit absorption of vitamins and minerals. So, from our perspective, the same warning could be applied to regular use in the mouth.
Whilst these remedies might be “natural” and might show results for “whiter” teeth, they are not healthy for the oral cavity. Although products such as baking soda have been used as home care adjuncts for decades, it can be destructive to both the teeth and gums. Baking soda is much too abrasive to use on the teeth. You might not see negative results after one use, but long-term use can cause abrasion and recession. Abrasion and recession can then lead to tooth sensitivity, cavities, and most importantly periodontal disease (which would render treatment more costly than professional whitening). Also-when whitening, you are not changing the color of the enamel. Whitening targets the dentin of the tooth not the enamel. However, I agree that it is important to use products to strengthen enamel. Products containing fluoride are great for strengthening the enamel.
As one dentist reporting for the Dentistry IQ website puts it, “It is a misnomer that whiter teeth are the same as healthy teeth, since tooth color has very little to do with the health of the tooth. The consumer perception, though, is that white teeth equal a healthy mouth, and perception is reality.” (1) Here’s the good news: Below I explain several home remedies that help naturally whiten your teeth, while also improving overall oral hygiene. The kind of toothpaste you use plus regular brushing and flossing, using baking soda , coconut oil pulling, and tooth-healthy diet can all whiten your teeth naturally — in addition to offering benefits like antibacterial and antiseptic protection. You may also want to check out the Environmental Working Group’s Skin Deep Cosmetics Database recommendations for the best kinds of toothpaste for teeth whitening. 
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