I called many American Companies like mountain rose herbs , redmond clay ,aztec clay and when I asked them about lead in their clay they said that every clay comes from the earth and that is why there is tiny amount lead in the clay, but it occurs naturally so it is bind with other elements in the clay and does not leak in the human body , so the human body can not absorb the naturally occuring lead in clay.
Whitening strips revolutionized the industry 10 years ago, as researchers figured out how to impregnate hydrogen peroxide on a polyethylene strip that the user places directly on the teeth. This product has existed in several iterations over the years. The various types of strips have differed in terms of the level of hydrogen peroxide in the gel to modifications in the shape and thicknesses of the strip. The efficacy is excellent for an OTC product, but you must be cautious not to burn your fingers or rest the strip on the gums, as this will cause irritation over time. If you are patient and compliant, you’ll see results in a few weeks. This method is best if you have two weeks to whiten.
Avoid smoking. Cigarettes and chewing tobacco are harmful to your oral health as they can cause stained teeth, gum disease, oral cancer, slow healing after a tooth extraction or surgery which increases the risk of dry socket, a dulled sense of taste and smell and bad breath.[14] Quitting is the only way to decrease your risk of these and other-tobacco related health problems.
As we age, the outer layer of tooth enamel wears away. The underlying layer, called dentin, is yellower. That's why it's important to try to avoid staining teeth in the first place, especially after whitening. If you take care with foods and drinks that discolor teeth, the results of whitening may last up to one year. Whitening teeth too often could make them look translucent and blue, so you'll want to maintain your new smile.

Whiter teeth, like thick, shiny, hair, is something that many people in our cosmetically driven world desire today. In fact, Americans spend over $1.4 billion dollars in over-the-counter teeth whitening products every year-that’s a good chunk of money just to achieve a different shade of teeth. I’ll be the first to admit that I’ve tried OTC teeth whitener-I even paid to have my dentist do it once. It worked for a bit, but my teeth got so sensitive I couldn’t stand it. I also felt I really didn’t need to be so obsessed with the color of my teeth that I paid a bunch of money for a bunch of who-knows-what that made my teeth hurt, so I started looking into more natural alternatives. With a bit of patience, I think you can naturally restore whiteness to your teeth. They may not get to be scary sear-out-somebodies-corneas –when-you –smile white, but they’ll appear more like you took good care of your pretty pearly whites rather than just bleaching them like crazy.
With each decade that we age, our teeth can get up to one to two shades darker. The color pigments inside teeth become more prominent as the dentin structure below the enamel grows. Consider the enamel to be like translucent glass, with the dentin structure shining through underneath, giving us our tooth color. Genetics play a large role in the darkening of our teeth extrinsically and intrinsically, but environmental factors, oral hygiene, and nutrition also contribute to the shade of our teeth.
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.
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:

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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