I brush twice a day but my teeth are still pretty yellow. I think

Drink light sodas. Also the obvious is avoid smoking, tea, coffee, etc.

Bicarbonate soda is very good, but use rarely otherwise you'll fuck your teeth up.

>>17126963
I use baking powder with my toothpaste, the gritty parts help a bit.
I have heard crushed charcoal helps, but I have never tried.
Other option you can go to the dentist, and try teeth whitening, if it is a concern. I have yet to try this also?

>>17126963
Maybe that's your natural teeth color? Ask a dentist before you corrode your teeth with whitening products

>>17126974
>I use baking powder with my toothpaste
You might wanna stop doing that unless you want your teeth to get corroded like OP.

Tea and Coffee will leave stains but those can be cleared out with whitening products.

Soda on the other hand will destroy enamel, everyone's teeth is yellow on the inside and if you have a weakened enamel the yellowness will show.

Repairing enamel is not really possible, so try whitening...but it'll just bring back its normal color with the weakened enamel so it'll probably stay yellowish.

In that scenario, you should go for veneers.

Good luck OP! Where there's a will there's a way.