A deep cleaning differs from a regular cleaning in that it is needed when there is a significant presence of tarter buildup underneath the gums. Tartar and bacteria build up when there is an opening along the teeth and gum line, often referred to as a pocket. Once a pocket is formed bacteria flocks to this area and can not be removed by brushing, flossing, or with regular teeth cleaning. Your gums will begin to inflame as a reaction to the bacteria and fight off infections. If not properly treated an infection will develop and can result in further damage including complete loss of teeth.