Advertisements preaching "Whitening of brown teeth" are common nowadays and indeed the whole of Ukambani. Why?
Well, cases of stained teeth are also common.
Many oral health experts have attributed the many cases of brown teeth to the use of hard water and chewing of miraa!
True, water is a rare commodity to many who are often forced to use the cheap hard or salty water.
According to www.health.com, black tea contains an antioxidant called tannin.
Tannin contains tannic acid which causes yellowing of teeth.
Www.webmd.com also describes tannins as plant-based compounds that make it easier for stains to stick to teeth.
Black tea, otherwise known as "strong tea" is what many families can afford for breakfast.
Unfortunately, it contains more tannins compared to milked tea or white tea and green tea.
Well, now you know!