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May be natural, but so is body odor and we shower and use deodorants.
Yellow teeth don't look good, it's just that simple, and whitening isn't expensive for most people - just go buy a box of a generic whitening kit from a drugstore. If it works for you, you win the whitening lottery.
Read the directions, the warnings, follow them.
I can't use most of them, as they hurt my teeth (I'm sensitive to the ingredients).
No, you're objectively wrong on this. It is more akin to cosmetic surgery because it is harmful for your teeth and potentially dangerous. This isn't a normal hygiene standard.
My dentist disagrees. He recommends moderation, but says it is not harmful, much less dangerous.
I do it myself, about once a year, and I don't have any issues at all.
My dentist said I could do it more often if I felt I needed to, 3-4 times a year, and my enamel would be fine, as long as I followed the directions.
I tried googling it and found no source that corroborated your statement. (I did find a Mayo Clinic and NYTimes article that both support my dentist's claim.)
I'm willing to listen if you can provide an article, but your "objectively wrong" comment seems a little, well, objectively wrong.
I have been told by my dentist that it can permanently damage your tooth enamel. I did a quick search and found an NIH study on enamel softening. It looks at hardness, but that is all. I only read the object and the abstract, but that part didn't mention enamel thickness. The study mentions that hardness is restored after about a week.
I would generally advise caution and just take your dentists advice about these things. I will admit I am generally biased about this and it definitely can be harmful if not done correctly.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4319295/