A dual-use tongue scraper is described, which can be used for routine oral hygiene maintenance and also research collection, quantification and analysis of plaque deposited on a subject's tongue. The scraper includes structure such as protuberances, apertures and porous bodies which collect plaque as it is scraped from a subject's tongue. In some embodiments such structure also arrays the plaque in a manner for visual quantification. The plaque may also be removed from the device for direct measurement and analysis. The method of the device's use for collection, quantification and analysis of plaque, as well as the method of its use for application of compositions to a subject's tongue, are also described.