Mahender Singh, a street dentist in Jaipur, India, sells dentures and pulls teeth in his sidewalk "office.".

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Caption: Mahender Singh, a street dentist in Jaipur, India, sells dentures and putts teeth in his sidewalk "office." Between patients, Singh douses his hands with antiseptic, although the occasional, fly might land on his patients or instruments. Like most dentists, he deadens the pain by...