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.
Teeth whitening strips may be more appropriate for the person who has more yellow teeth. These are plastic strips coated on one side with hydrogen peroxide. They can be used nightly for two to four weeks depending upon the degree to which you want to produce a lighter shade. They still are not as effective as dental whitening, but they can create lighter teeth. Most four-week kits cost between 20-40 USD. The strips don’t necessarily adhere completely to the teeth, and there may be more whitening in front than in the back of each tooth.
Eat more crunchy fruits and vegetables. A big part of keeping your teeth clean involves eating the right foods. 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.
Rinse your mouth with water. Rinsing with water after meals or drinking caffeinated beverages will help remove any leftover food or residue from your teeth will help prevent stain and decay.  This method is especially useful if you’re away from home and don’t get a chance to brush or floss after eating. Drinking water throughout the day and rinsing with clean water after meals is the most underrated method of overall oral health.
2. The second consideration on this subject is whether oil pulling is going to compromise any existing fillings (mercury or composite). This is another myth circulating on this subject. If a filling becomes compromised from oil pulling, then it was compromised already and the oil pulling simply helped it along its path to failure. In other words, oil pulling will not cause a properly placed filling to become weaker. However, if a filling is weak (and therefore should be changed as it’s not doing its job to restore the tooth), then we can see how oil pulling could further weaken the filling and increase its speed of failure. I consider this a benefit as the filling in question was already compromised and needs to be changed but we may have not been aware that it had already failed.
The reason why you might need to whiten your teeth is because certain foods and drinks stain our teeth. A tooth is made of 3 layers, the 2 most external ones, enamel and dentin, are the ones which are responsible for the teeth color. They naturally weaken as we age, but if we consume lots of junk food, they can turn yellow more quickly. So, when we talk about how to whiten teeth naturally fast at home, we talk about whitening the enamel and dentin. All of our home remedies to whiten teeth instantly will also work as preventive measures, together with a balanced diet and good teeth cleaning habits. Let's now come to how to whiten teeth naturally fast at home.
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.
The key to using ACV for teeth whitening is to be consistent, using it for at least a month continuously in order to see the best results. However, be careful, as with all acids it can remove the enamel on your teeth if you brush too hard or use too much. After brushing with ACV, you need to brush again with regular toothpaste, preferably a non-fluoride paste, or rinse your mouth out well.
You can also whiten your teeth at home with gels that are placed in mouth guards and worn at night. This is often the same procedure a dentist uses to whiten your teeth, but the peroxide level is weaker in over the counter kits. Further, mouth guards are custom made for people at the dentist. Finding a mouth guard that fits properly may be problematic with over the counter sets.
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.
Not only is it bad for your health, smoking is one of the worst offenders when it comes to staining teeth. Tobacco causes brown stains that penetrate the grooves and pits of tooth enamel. Tobacco stains can be hard to remove by brushing alone. The longer you smoke, the more entrenched the stains become. Smoking also causes bad breath and gingivitis (gum disease), and increases the risk of most types of cancer.
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.
A friend just told me about the “pulling” with Coconut Oil. She said it kills bacteria and whitens teeth. I have fairly white teeth, but I drink 3 cups of tea every morning, and I have places where I had tea stains. Didn’t want to use the expensive whiteners, and end up with the “fake” and almost “blue/white” looking teeth I see too much of. Bought a $5.99 jar of organic coconut oil at TJ Maxx yesterday. I spoon about 1/2 tablespoon into my hand, soften it up, then put the paste on my toothbrush. After one day and only 2 brushings, the tea stains are GONE. I’m sold !!!!!!!
Underneath the enamel is a pale brown substance called dentin, which can become more visible when enamel gets thinner — a very common occurrence for many adults. (2) Dental erosion (erosive tooth wear) results from chronic loss of dental hard tissue that is chemically etched away from the tooth surface by acid and/or chelation (without bacterial involvement). (3) What are some of the reasons enamel thins? Risk factors include aging, genetics and intake of foods that promote erosion and/or staining. Many of these same unhealthy habits also increase your risk for gum disease.