The purpose of this study is to measure the human breathes of denture wearers by using breath sensor, and to evaluate the influence of denture cleansing. The following results were obtained. 1. There is a possibility that the human breathes of full denture wearers may originate from their dentures. 2. There is a possibility that the cleansed dentures may cover the smell of the patient's oral mucosa itself and may reduce the apparent human breathes. Anyhow, the human breathes of denture wearers reduce significantly by using the denture cleanser.