Even if you practice the best oral hygiene, there are bacteria in your mouth. These bacteria, along with proteins and food by-products, form a sticky film called dental plaque. This film coats teeth. Plaque is most prevalent in areas that are hard to clean - like the back teeth - just along the gum line, and around fillings or other dental products.such deposits, if not removed, cause infection and loosening of the gums, ultimately leading to pyorrhoea and tooth loss.