Animal dealers either pull the front teeth with pliers or wire cutters or they cut them off with nail cutters to deceive buyers into thinking the animal is a baby!
This results in severe bleeding, which sometimes causes shock or death.
The slow lorises found in animal markets are usually underweight and malnourished, and have had their fur dyed, which complicates species identification at rescue centers. According to primatologist Anna Nekaris, these youtube videos are misunderstood by most people who watch them, since most do not realize that it is illegal in most countries to own them as pets and that the slow lorises in the videos are only docile because that is their passive defensive reaction to threatening situations. -from wikipedia