Wong Sir, a police officer in Hong Kong, was attacked by protesters with a slingshot and steel balls, which broke one of his teeth into four pieces in a recent law enforcement operation to disperse rioters. He said Hong Kong police always achieve their goals with limited use of force. 

"HK police are always protecting the lives of residents, maintaining order and law. We are here to protect everyone in society. So we'll continue playing this role and do our work at our best."