Hello lybrate-user it's very nice to hear that you have quit smoking, now you should undergo cleaning (scaling) procedure to remove all the unwanted tar deposits from your teeth bringing their colour back to original.
You can get a cleaning done by a dentist once and than brush twice a day.
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Suggestions offered by doctors on Lybrate are of advisory nature i.e., for educational and informational purposes only. Content posted on, created for, or compiled by Lybrate is not intended or designed to replace your doctor's independent judgment about any symptom, condition, or the appropriateness or risks of a procedure or treatment for a given person.