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 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.
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. 

P.S. For people who think this is acidic and eats away your enamel: You first of all have three layers of enamel, secondly if you did science you would have done an experiment in which you neutralize a base (sodium hydroxide) with an acid (hydrochloric acid) and when the two mix they neutralize to be neither acidic or basic but neutral. This is the same principle and that’s why there is far more baking soda to make sure the ph is more basic than acidic.


Perhaps the intensity of the heat in the professional whitening lights is the culprit? Or maybe your sensitivity and irritation is caused by the caustic breakdown of the carbamide peroxide formula used in tray and gel whitening methods? No matter what the source of the discomfort is, here are some facts to help guide you in making the right choice when it comes to your preferred method of whitening:
First of all, one of the reasons why you are looking at how to whiten teeth naturally fast at home is probably because you already know that professional teeth whitening is nor cheap, neither is healthy. Professional teeth whitening can leave your teeth very sensitive and weak. So, since it is possible, you should try and whiten your teeth naturally at home.
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…)
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!
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