Asked for male, 19years old from Allahabad
Yellow teeth could me many reasons
top most are
1. You might take some medication.
2. You are not brushing at night / in morning / or using datun or using red paste.
4. Water in your area
there are many other reasons
for whitening your teeth
some toothpaste availabe
- glizer Dr. Reddy
-colgate white sparkle
some mouthwash avaiable
-hydrogen peroxide mouthwash 3: 1
some home whitening kit availabe (for this you need to visit dentist)
also most effective is in office teeth whitening (dentist visit)
before going for whitening you first need to find out the reason of yellowness of your teeth.
Send some pictures for more detail answers.