Plaque is a sticky film that forms on your teeth. It is made from bacteria and sugar. The bacteria in plaque feed on sugars and other nasty ingredients found in our diets and saliva. Plaque is the main cause of dental cavities and other issues in the mouth such as gum disease. The acids found in plaque eat away at the tooth enamel and gum causing cavities and gingivitis, red swollen and bleeding gums.
Calculus is plaque that has hardened on your teeth. This cannot be removed with an ordinary toothbrush and does require the dentist to use a Scaler. Calculus forms around the gum line and underneath the gums, causing cavities, gingivitis or more seriously, gum disease.