Short answer - Your teeth are extremely porous, this means they have microscopic
grooves that soak up anything that you might see staining a coffee cup.
Have you ever noticed that old coffee cups end up brown tinged inside? That's because
over time they soak up the tannins of coffee/tea and over time the build up becomes a
discoloration.
Itÿs the same for teeth. Years of drinking things like tea, coffee, coke, colored juices, red
wine etc. build up in those tiny grooves on your teeth, as does food, and over time
(despite brushing) your teeth soak up those foods and drinks and causes your teeth to
look yellow.
Getting them whitened can help (the products used are so strong they break down and
disintegrate the staining), however they can also impact the texture and surface of your
teeth, making them more porous, meaning more susceptible to staining.
Coconut oil is amazing to do coconut pulling, and using non fluoride toothpaste and
homemade mouth wash (all equally if more more effective than store bought or modern
options) all help to keep your teeth white but most importantly HEALTHY!!
Full story:
https://www.quora.com/Why-do-teeth-turn-yellow-even-if-you-brush-every-day
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