Coming in for a regular cleaning and exam will reduce the chance of decay and increase oral health. There is a layer of bacteria on teeth that grows into plaque. When the plaque is not removed it gets hard and is called calculus. This calculus can only be removed by the metal instruments a Hygenist uses at your dental cleaning. If this calculus is not removed it causes infections in the gums that start as gingivitis and can turn into periodontal disease and eventually result in tooth loss.