Hi sir...
You need to do cleaning(scaling and polishing) which will removes stains and calculus deposits in your teeth ..
you can also proceed with teeth whitening procedure which is the laser teeth whitening which will makes your teeth two times brighter than normal...
No specific medicine is available to sign your teeth
Next Steps
kinly visit nearby dentist for furthur consultation and management...
Health Tips
HELPFUL TIPS :
Do brush and flossing your teeth twice daily
Do rinsing with mouth wash twice daily after food
Do visit dentist for every 6 months..