Hi,
Colour of the teeth are determined various factors like tea / coffee consumption,face complexion ( fair people have dark teeth where as people with brown skin have lighter brighter teeth) and has nothing to do with how strong your teeth are
Next Steps
use toothpaste Glodent twice a day
if you want a shade or two lighter teeth
you can get polishing done ( they are inexpensive) or
you can also go for a chairside whitening procedure with any dentist they are painless
hope this was helpful to you
Dr. Prachi Lalji