I took this photo at a cattle market I stumbled upon on the road in West Bengal (India).

All the local farmers were there to buy and sell livestock. Most of them were Muslim. This is a portrait of one of those farmers.

The brown color of his teeth is probably from chewing Betel nut. Betel nut is consumed by many people in India, as a psycho-stimulating and euphoria-inducing drug. Or maybe from chewing tobacco.