Objective To understand betel nut chewing and oral health knowledge and behavior habits of residents in Changsha and Xiangtan Cities of Hunan Province,so as to provide information and basis for oral health care decision-making in Hunan Province.Methods A total of 507 ur...MORE Objective To understand betel nut chewing and oral health knowledge and behavior habits of residents in Changsha and Xiangtan Cities of Hunan Province,so as to provide information and basis for oral health care decision-making in Hunan Province.Methods A total of 507 urba...