What stains teeth?

Coffee; especially black coffee. Coffee stains more than tea does.Tea; again, especially when black.Red wine.Dark cola drinks and some fruit juices (cranberry and grape for example).Certain foods such as curries and dark berries.Smoking (and chewing) tobacco.Chlorhexidine mouthwash; a common example of what stains teeth, but one that you may not be aware of!Poor oral hygiene can result in green or black staining.Iron supplements and some medications.