<qa>  What is the purpose of this behavioral effectiveness trial?The purpose of this behavioral effectiveness trial is to test the feasibility, effectiveness, cost-effectiveness, and sustainability of a team approach for delivering smoking cessation assistance to interested smokers seen within a single well-integrated group-model dental HMO. We and others have already demonstrated the efficacy of the 5-A model in medical and hospital clinical settings. The need now is to show that a practical and innovative team approach with a centralized tobacco quitline component 1 can be disseminated throughout dental care offices; 2 can be effectively and consistently delivered by dentists and hygienists; 3can be maintained over time, and 4 will have a positive and cost-effective impact on patient smoking-cessation rates. 