Cleaning or scaling of teeth can be done once in 6 months professionally by a Dentist or a hygienist.
Teeth whitening is different from teeth cleaning. The natural color of our teeth is pale yellow ., and severe discolouration can be caused due to varied reasons ranging from smoking , gutka to having tea and coffee.
Scaling and polishing removes the stains and calculus .
If you want to get a shade lighter , then you hav bleaching, but then it is also not permanent.
Next Steps
go to the nearest Dental centre and put your concerns.
Health Tips
try flossing between the teeth to remove inter dental debris.