teeth are continually bathed in saliva which contains calcium and other
substances which help strengthen and protect the teeth.
|While this is a good thing, it also means that we tend to get a build-up of calcium deposits on the teeth.
|This chalky substance will eventually build up over time, like
limescale in a pipe or kettle. Usually it is tooth coloured and can
easily be mistaken as part of the teeth, but it also can vary from brown
to black in colour.
|If the scale, or calculus (tartar, as dentists like to call it) is
allowed to accumulate on the teeth it will unfortunately provide the
right conditions for bacteria to thrive next to the gums.
|The purpose of the cleaning and polishing is basically to leave the
surfaces of the teeth clean and smooth so that bacteria are unable to
stick to them and you have a better chance of keeping the teeth clean
during your regular home care.