Why my tooth are badly stained although I seldom take coffee, tea? How to prevent tooth stain in future?

[blakeex]

I am not a smoker, drinker. I also seldom drink coffee, tea. I rarely take any sweet as well.

However, when I visited my dentist, she was shocked to discover how bad my tooth stain was. So she did a scaling & polishing work.

She asked me whether I am a smoker drinker, or taking coffee, tea. I said no to all of them & she could not find a reason behind my tooth stain.

This was my first scale & polish work done by a dentist in few years. My previous dentist did not provide such service due to Covid restriction.

1. Why my tooth have many stain?
2. How do I prevent tooth stain in future?

Thank you