Plaque is a yellow layer or bacteria that forms in teeth naturally while tartar is a dental calculus. Tarter is a complication of plaque. These two situations could be considered two stages of the same pathological process. However, there are a few fundamental differences between tarter and plaque. Dentists consider plaque formation as a defense mechanism to prevent colonization of disease-causing bacteria.
Biofilm, also known as dental plaque is soft enough to come off easily at first. Tarter is hard, the yellow layer which forms around the base of your teeth if plaque is allowed to develop freely and not appropriately removed. Dental plaque is soft, while tartar is hard. Plaque can be removed while brushing while tarter cannot.