Over-the-counter tray and gels have been around the longest. Known as a “boil and bite” system, they require you to heat a tray, fill it with gel, and place the formed tray in your mouth. This whitening method takes weeks to deliver results, and 80 percent of users report sensitivity due to the breakdown of the carbamide peroxide gel. While the tray helps prevent oxygen from escaping, there are other options that can lead to efficacious whitening without the soft tissue irritation and pain. 
I think you are right on with your thinking here. Incidentally, on the Mohr’s scale of hardness (where diamonds are 10), ironically activated charcoal is only around 2. However, your point about RDA for charcoal is another subject all together. I don’t know the RDA for activated charcoal by itself, but my guess is it’s pretty high. My reasoning for this guess is a company who makes a tooth powder that uses activated charcoal as one of it’s ingredients states that the RDA for their product is 117. Yikes! Sure, it’s lower than some ‘whitening’ commercial pastes on the market, but that’s not a very high standard to judge one’s product safety.

At-home trays: If you get them from your dentist, she’ll make a mold of your teeth to create fitted trays. She’ll give you a strong bleaching gel to use at home. Over-the-counter systems work the same way. But they can cause irritation and may not work as well. Some OTC kits come with a bendable mouthpiece. These work better than one-size-fits-all trays. The bleaching gels that come in these kits aren’t as strong as the ones you get from a pro.

Limit your intake of fruits that contain citric acid, such as oranges, lemons, berries and tomatoes. Too much citric acid can cause enamel erosion.[27] However, don’t completely avoid these fruits unless you have a digestive condition or allergy. These fruits contain many nutrients that are essential for bodily functions and contribute to creating a strong immune system.
Do you want to whiten teeth fast, but you want to do it naturally and cheaply? There are some home remedies to whiten teeth instantly that might just be available in your kitchen, you only need to discover how to use them. If you thought that the only way to whiten teeth instantly is by going to the dentist and carrying out expensive procedures, you are wrong. We will teach you some home remedies to whiten teeth instantly that will not only whiten your teeth, they also won't damage them, and won't cost a fortune. So take note as on OneHowTo we explain how to whiten teeth naturally fast at home.

We are told that conventional teeth whitening (bleaching) is safe from experts.  Yet others warn of the risks of conventional teeth whitening.  Much of the confusion stems from the fact that the ‘facts’ around teeth whitening have been blurred intentionally.  Then we hear how Julia Roberts only uses baking soda to keep her smile bright.  But is baking soda even a safe option?
Do you happen to know the RDA / hardness of activated charcoal? It seems like it would be way too abrasive and hard to brush your teeth with. Perhaps the disparity of reports between users is that some are just swishing it around, while others are brushing it into their teeth, which, at that point, seems like it would not be the actual characteristics of the charcoal doing the whitening, as it would instead be the abrasive quality of it in general. (After all, diamonds are made of carbon too…)
We are told that conventional teeth whitening (bleaching) is safe from experts.  Yet others warn of the risks of conventional teeth whitening.  Much of the confusion stems from the fact that the ‘facts’ around teeth whitening have been blurred intentionally.  Then we hear how Julia Roberts only uses baking soda to keep her smile bright.  But is baking soda even a safe option?
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.
One thing to be aware of when it comes to whitening teeth is that certain natural whiteners can eradicate enamel. Some teeth whiteners are just not a good idea to use, especially lemon juice. While the lemon peel is actually a good, healthy way to whiten teeth, the juice itself is simply too strong. The acid in the actual lemon juice does great for bleaching clothes, hair and getting stains out of furniture, but you wouldn’t want to put lemon juice on your teeth as a mouth gum cleaner every single day. Eventually, the acid creates tiny holes in your teeth, and then every kind of staining type food will seep into these tiny holes and remain there. The acid from the lemons is so strong it just eventually wears away the teeth, causing cavities.

Oral irrigators are electrical devices that pump water in a steady or pulsating stream to flush out food and debris in pockets between teeth, or in braces. They also are used to deliver medicine to hard-to-reach areas. For example, prescription rinses can be sprayed into gum pockets with an oral irrigator. You can also use an oral irrigator with a diluted mouthwash, which is helpful for those who have dental implants or bridges.
If I were in the shoes of a person with this situation, I would exhaust natural methods first before shifting to bleaching. For example, I’d do a ’30 day oil pulling’ commitment for myself. Everyday for a month, I’d oil pull and take ‘before and after’ photos so I could see the changes. That way, if I still wasn’t satisfied with the whiteness, I would know that I had tried less invasive strategies prior to choosing a method that may challenge my teeth.
Whitening devices appeared on store shelves approximately two years ago, bringing elements of professional lightening to the user at home. Heat works to accelerate the breakdown of hydrogen peroxide, creating more whitening oxygens. High-intensity lights are required to accelerate the reaction rate of the hydrogen peroxide, meaning users and those in the immediate vicinity must wear protective eyewear. By combining the professional elements of light and heat in a closed system mouthpiece, along with a non-migrating gel, the device calls upon the professional whitening experience. If you are short on time, this device may whiten your teeth in two days. 
Español: blanquear los dientes de forma natural, Português: Clarear os Dentes Naturalmente, Русский: отбелить зубы натуральными средствами, Italiano: Sbiancare i Denti in Modo Naturale, Français: avoir des dents plus blanches naturellement, Deutsch: Zähne natürlich aufhellen, 中文: 自然美白牙齿, Čeština: Jak přirozeně vybělit zuby, Bahasa Indonesia: Memutihkan Gigi Secara Alami, 日本語: 自然に歯を白くする, العربية: تبييض الأسنان بطرق طبيعية
Paint or brush on formulas are among the cheapest methods to whiten your teeth, usually about 5-10 US dollars (USD) at a local drugstore. After brushing your teeth in the morning or evening, you simply apply a whitening formula to the teeth. This will probably work on teeth that only need to be lightened a few shades. Very yellow teeth, and teeth stained through use of medications like tetracycline are unlikely to respond to this method.
Can it be true? Coconut oil to clean your teeth? Just when you thought you heard it all when it comes to coconut oil, along comes the news that coconut oil pulling can serve as a natural teeth whitener. Some people attest to their teeth becoming whiter and overall healthier by applying coconut oil to their teeth after they brush, and most people praise the results of oil pulling.
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