Not problem anymore. You can start with a thorough cleaning and polishing by your dentist and hygienist. If not not satisfied, you can escalate to get the teeth whitening/bleaching (oct, or regular pharmacy shelves products). If still not satisfied, then you can get professional in office bleaching, these days with a variety of bleaching potency percentages. / good luck.
See a dentist. A dentist needs to evaluate your teeth to determine the most effective way to improve your smile. Often a combination of in-office and at-home teeth whitening will produce significantly white teeth. I have had tremendous results with either in- office zoom! And take home tray vtreatments or the kor system.