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.
One simple strategy can help maintain white teeth: brush. Brush at least twice daily. Even better, brush after every meal and snack. Brushing helps prevent stains and yellow teeth, especially at the gum line. Both electric and sonic toothbrushes may be superior to traditional toothbrushes in removing plaque and surface stains on teeth. Also, don't forget to floss and use an antiseptic mouthwash daily.
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. 
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.
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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. 
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.
7. Drink with a Straw: This last method of naturally whitening teeth is more of preventative measure. Drinking through a straw can help you avoid many stains as teeth with have less contact with damaging drinks or substances. This can be very useful especially if you drink tea and/or coffee which can increases surface stains on teeth. You can find many options for glass and stainless steel straws online.

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.
To oil pull, simply put a spoonful of coconut oil in your mouth and swish it between your teeth for five to 20 minutes, or add a few drops to your toothbrush and brush it on. Another oral care option is to apply coconut oil to a corner of a clean washcloth and rub it on the teeth. A bonus regarding coconut pulling? Coconut oil has antimicrobial properties, so it’s great for protecting and cleaning your gums as well.
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