Our mouth is constantly bathed by saliva, saliva helps to keep our mouth moist and wash out food debris, saliva also contains buffering agent, which can reduce the level of acids which cause decay of teeth, plaque is a soft substance which sticks to tooth, it contians colanies of bacteria and other organisms, clumping with bits of food, if the plaque is left alone it absorbs minerals form saliva and eventually become calcuals, new plaque form on the existing claculas

When the plaque are in the early stages they can be removed by brushing. brushing is the most single activity which helps to keep the teeth clean form plaque, thus preventing tooth decay and gum disease, brushes should be soft in texture and held at 45degree angle to gums and moved back and froth direction or rotate it from gums to teeth side.

It is a good prctice to brush twice a day especially after dinner, the common errors are holding the brush in inproper angualtion, thus the ineffiency to reach interdental spaces and the gingival crevice, incorrect brushing can cause recession of gums and abrasion the cervical margins of teeth.