BRI prompts closer global scientific cooperation

China is increasingly working with other countries to improve people's lives overseas. Zhang Zhihao reports.

When botanist Wang Qingfeng first visited Kenya 18 years ago, he was fascinated by the fact that many locals had snow-white teeth, but they did not use fancy dental products.

The secret was found in twigs, known as miswak, from the Salvadora persica tree. When chewed, the miswak splits into soft, bristly fibers and releases natural, antimicrobial compounds that can protect the mouth from oral disease, according to the World Health Organization.