Tartar (calcified plaque) forms regularly near the ducts of salivary glands in the mouth. These are in the area of the lower incisors and upper back molars. The calcified plaque discolors over time through the components of the food. Tartar prevents the cleaning of the tooth and provides an optimal breeding ground for bacteria. The limited dental hygiene in the affected area is the cause of numerous diseases of the tooth and the periodontium. The calcified plaque occurs not only in adults, but also in children. A daily oral hygiene in combination with a regular professional tooth cleaning at the dentist is therefore obligatory for a healthy oral hygiene.