HELLO SIR...
Teeth whitening is not a lifetime solution....
TEETH WHITENING is also known as tooth bleaching which is a cosmetic procedure used to remove intrinsic stains(mild fluorosis)....
for extrinsic stains(deposits,coffee ,tea stains,pan and smoking stains) you can go for scaling and polishing.....
clinical examination is necessary to decide what kind of treatment you need......
Next Steps
kindly visit dentist for furthur management