Recently I found a few bleaching recommendations on the internet. I was both amazed and frightened by what was apparently written by non Dental personelle. I wrote replies to each of these below. Hopefully you will understand both what TO do and what NOT to do. As well I hope to convey that "Just because it is on the internet does not make it true". Please read aware of the SOURCE of this information. UNDERLINED COMMENTS ARE THE COPIED INFORMATION.
> Foods that naturally whiten your teeth:>
> Strawberries - bc they contain malic acid, which is also found in whitening toothpastes
Even with the malic acid however that is not the whitening ingredient is a preservative for the paste. It is not helpful and actually damaging on its own. While very nutritious too many strawberries can help form cavities. The acid and sugar combined are enemies of the teeth. The red coloring is also going to stain a tooth because acid makes a tooth porous and more likely to absorb stains. I say no on the strawberries as whitening.
> Apples, celery, carrots - natural stain removers
Each of these foods requires extra chewing. Because they are fibrous they will naturally scrub the tooth structure with each bite.
> Lemon Juice - mix half water, half lemon juice once or twice a week bc it will naturally "bleach" your teeth - (think about how we used to use lemon juice in our hair to lighten it) - but don't overdo it by using straight lemon juice bc it will be too acidic (harmful) for enamel.
NO NO, Lemon Juice acid will lighten hair because hair is Collagen. Acid breaks up the collagen structure and changes the color. Enamel is irreversibly damaged by the acid if in excess. Dringin lemon juice is ok but the mixture here is WAY too concentrated. Citric Acid is very potent and dissolves enamel in seconds. Eat lemons sparingly for flavor NOT for bleaching teeth.
> Yogurt, milk and cheese - lactic acid,
Yogurt (plain not with added colored fruits) and cheese (and not with artificial or natural dyes) help NOT to stain the teeth but will not inherently whiten. Yogurt does have the added benefit of adding GOOD bacteria to the mouth and GI tract. These good bacteria will actually benefit the mouth by competing for the same food that bad bacteria need to live. Less bad bacteria leads to less stain. The foods themselves do not bleach they just do not harm.
> Oranges and pineapples -
Same as lemons Good to eat but not for prolonged contact with teeth.
> Chocolate - an antibacterial because of the cocoa bean husk?
Interestingly enough. I read a research article years ago, I believe it was from the late 1930s or 40s, it did state that the cocoa is actually antibacterial. The problem is that we are not going to find much cocoa in chocolate these days. I find more and more soybean fillers and sugar than actual cocoa. I believe cocoa that is unrefined is quite bitter and not as palatable as we might think. The dark coloring of cocoa will not be beneficial to the color of teeth.