Objectives : There were reports about the decreasing of quit-smoking ratio because of taking professional advices. This study were to investigate smoking prevalence rate of the dental hygienist study in nationwide and quit-smoking counseling activity for patients in dental clinic. Methods : The registered Korea Dental Hygienists Association Meeting in 2005 were recruited as subjects. The personal surveyed, 486(87.7%) returned completed questionnaires. Results : The smoking rate of dental hygienist is 3.1%, past smoking rate 1.4% and smoking cessation 95.5%. In smoking cessation counseling activity, only 20.8% of dental hygienist would advise to quit smoking. However, 63.8% intended to advise to quit smoking but they have no idea about quit smoking program and 15.4% had no intention of advising to quit. It is a whole consent that Smoking dental hygienist is tend to against smoking and necessary training about smoking cessation same opinion. Conclusions : Dental hygienist is more effective for health care professional to help people stop smoking, therefore dental hygienist is important for them to have through knowledge of subject and confidence in their role in smoking cessation.