Good oral hygiene is a tried-and-true method for keeping your smile looking its best. Toothpastes gently buff out stains from the surface of your teeth. Whitening toothpastes work the same way with more ingredients; they don't bleach your teeth. Flossing gets rid of food and bacteria that could harden into plaque, which makes your teeth look dull and darker.
It makes sense that apple cider vinegar (ACV), which effectively works as a natural antibiotic and teeth/gum cleanser, would also be able to remove stubborn stains on the teeth. ACV is especially helpful for removing stains due to common culprits like coffee and nicotine (smoking). Some report that after using ACV it looks like you just got your teeth professionally cleaned!
I simply dip my toothbrush into some powdered charcoal that I keep in a small jar on my counter and brush as normal. Another way that will produce results more quickly is to mix a teaspoon of charcoal powder into some water and swish with it for a few minutes. Then, spit the water and leave the remaining charcoal in the mouth for a few minutes so that it has time to bind to stains.
In the morning, before you brush your teeth, scoop out a tablespoon or a little less (depending on the size of your mouth) of coconut oil. You can either soften it, or just put it in your mouth (I usually do the latter, and just let it soften.) Push, swish, and “pull” the oil through and around your teeth for 10-15 minutes, then spit it out, rinse with water, and brush your teeth.
This really is the best kept secret of how to whiten teeth naturally fast at home. Coconut oil was used as a toothpaste in India. Coconut oil contains lauric acid, which combats the bacteria responsible for teeth yellowing, while also keeping the breath fresh. You can use it as often as you like, as coconut oil does not bleach, it gets rid of the bacteria responsible for yellow teeth. It is an amazing home remedy for teeth whitening for sensitive teeth. It also tastes good, and is cheap. Here is how to whiten teeth with coconut oil:

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.
Research has shown that teeth-whitening products can damage the teeth by removing too much enamel. Conventional whitening strips, and other whitening products, contain a gel with the active ingredient carbamide peroxide, which breaks down into hydrogen peroxide and a waste product called urea. Constant application of whitening strips has been shown to cause erosion of enamel over time and also promote tooth sensitivity, especially when eating hot and cold liquids or acidic foods.
Fight plaque with coconut oil and mint leaves. Coconut oil is a natural emulsifier which helps clean your teeth, reduce stains and fight off plaque and cavity causing bacteria.[19] Mix a small amount of mashed peppermint or spearmint leaves (approx. 1–2 grams) with two to three tablespoons of coconut oil to use as a whitening paste or mouthwash. The peppermint leaves help keep your breath fresh throughout the day.
Choose the right floss. Flossing is one the most important steps in your dental care routine besides brushing.[8] Commercial floss is made from synthetic nylon or plastic filaments. It is often treated with flavoring agents, such as mint or lemon, artificial sweeteners and sugar alcohols, such as xylitol and mannitol, to make flossing more pleasant. They may also be waxed with beeswax or plant-based wax for ease of use. Keep in mind, however, that there is no difference in the effectiveness of waxed or unwaxed floss.

The antibiotic tetracycline causes gray teeth in children whose teeth are still developing. Antibacterial mouthwashes that contain chlorhexidine or cetylpyridinium chloride can also stain teeth. Some antihistamines, antipsychotic drugs, and blood pressure medications cause tooth stains, as can iron and excess fluoride. If bleaching doesn't help, ask your dentist about dental bonding, in which a tooth-colored material is applied to teeth.
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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.

Whitening toothpastes usually contain mild abrasives that are typically mineral compounds such as magnesium carbonate, hydrated aluminum oxides and calcium carbonate. These help remove surface stains that cause yellowing and help you to achieve a brighter tooth surface. Whitening toothpastes also often contain a small percentage of hydrogen peroxide, a bleaching agent that helps remove stains.
Dip your toothbrush into a sea salt mixture. Instead of using toothpaste, dip your toothbrush into a sea salt mixture for 3–5 minutes, made by dissolving ½ teaspoon of salt in 1 fluid ounce of water, and brush your teeth with it. The salt temporarily increases the pH balance of your mouth, turning it into an alkaline environment in which germs and bacteria cannot survive.
Avoiding smoking cigarettes, drinking too much coffee and/or soda, improving your oral hygiene overall, and eating a healthy diet can all also help prevent yellow teeth. If you do regularly drink staining beverages, do so through a straw and try to cut back. Try to drink more plain water after eating or drinking something staining or acidic to help reduce the negative effects.
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