Profile: Chinese botanist's adventures in African jungles
When Professor Wang Qingfeng, a Chinese botanist, visited Kenya for the first time 17 years ago, he was amazed to find the secret of some Kenyans' snow-white teeth: they use branches of "toothbrush trees" to brush their teeth, instead of a toothbrush and toothpaste. Seventeen years later, Wang's team and Chinese companies in Kenya have succeeded in making toothpaste with extracts from the tree native to Kenya.
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