Brushing teeth regularly is undoubtedly a good practice, however, brushing helps only
with superficial dirt.

The natural wear and tear process gradually make the outer enamel thinner allowing the
yellowish dentine below it become visible. There is nothing anyone can do about it.

Moreover, eating habits affect tooth's appearance significantly. Coffee, tea, and certain
fruit cause stains on enamel due to staining pigments present in them. In other words,
brushing does not help because the damage is done.

One cannot also ignore genetics, which affects tooth appearance as well. Some individuals are lucky enough to have a thicker and more whitish enamel. As for others,
the problem lies in the fact that no matter how often they brush their teeth, the
situation will remain the same because they were simply not born that way.

Of course, age negatively impacts enamel's health by making it thinner while dentine
gets darker at the same time. Antibiotics such as tetracycline taken in childhood result in
staining, which is internal and cannot be brushed away easily.

Fluoride is another thing that can be overlooked ÿ when there's too much fluoride in
your developing teeth, it results in white or brown spots known as fluorosis; oddly
enough, fluorosis comes from too much of a good thing.

Brushing prevents decay and cleans away new stains before they have time to set, yet it
wasn't invented for fighting genetics, aging, or stains that have already taken hold in
your teeth.

An exceptional web group exists where you can read true stories from people who have
experienced various health concerns associated with such a problem and its causes, the
diagnosis, and successful treatment methods. Perhaps, it might be useful to you at some
point in the future.

Full story: https://www.quora.com/Why-do-teeth-turn-yellow-even-if-you-brush-every-day

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