Teeth have a natural color of their own and the color varies from patient to patient. If you have yellow teeth you can go for a procedure called bleaching
that can again be of 2 types 1. Home bleach 2. Clinical bleach. Consult your dentist
for the same. In home bleach you will be provided a kit and you have to bleach at the comfort of your home. In clinical bleach you will have to visit a dentist and get the treatment done. I hope this helps.