Dear practo user
Stains on teeth keep forming, irrespective of the number of times you get scaling done. It all depends on the quality of brushing and other dietary habits. Tea or coffee, carbonated beverages, chocolates, anything can cause stains.
Next Steps
clarify the cause of stains from your dentist
Health Tips
brush twice daily
rinse with warm salt water twice daily at least for a minute.
learn correct brushing techniques
chew gum if you don't have any cavities or other pathology.
use dental floss