What could be a reason for the fact that I get brown stains on my front teeth quite easily (in comparison to others)?

I brush my teeth twice a day for about 3 minutes. I don't drink coffee or smoke. I do drink tea, but mostly green and herbal. (Generally 0-2 cups a day) In comparison to some family members my teeth stain easily. What could be the reason for this? Is there a way to help it?

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