A dental cleaning is like spring cleaning the house! On a daily basis, the food that is eaten as well as the saliva content causes a film to attach to the surface of the tooth. This allows more food and more bacteria to attach to the tooth which would result in tooth decay or gum disease if not removed. Dental cleaning is recommended to be done every 6 months as a spring cleaning activity. Sometimes, when people forget to have dental cleaning every 6 months, bleeding can already occur when they brush their teeth, that is the first sign of an infection. This could also lead to more serious gum health if left untreated for a period of time.