How well do teeth whitening strips work?

Will people with personal experience, dentists, specialists, or other smart people please tell me their opinions on teeth whitening strips and other whitening methods? My teeth are for some reason yellower than I would like :/

Any ‘myth’ methods that actually work for teeth whitening ?

Does anyone know any DIY teeth whitening that actually works and isn’t harmful to your teeth ? Or any products that give instant effects ? How harmful IS baking soda to your teeth ? Incoming search terms for the article:hydrogen peroxide baking soda

Is there any teeth whitening strips that can work with a gap?

Hello i am in need of teeth whitening and i really need to know if any strips can help me because i have a gap. My two front teeth has a opening between them! HELP!

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