Hi...
You must have got stains on your teeth which reappeared after your first cleaning treatment. You should go for the cleaning once again.
If you are a tea/coffee or a chocolate lover than such habits add on to your stains so avoid such foodstuffs especially at night before you go to bed.
Next Steps
Visit a dentist for cleaning your teeth and ask him to polish them thoroughly so the surface of your teeth is smooth and lustrous and they dont catch any stain in near future.
Health Tips
Brush regularly with vertical strokes especially while going to bed and in the morning as well.
Floss between your teeth twice a week at least to maintain good and healthy gums and clean teeth