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Toothpaste
 May
contain Fluoride – often illustrated on the packet. The Enamel
in our teeth is made up of hydroxyapatite, a calcium-based mineral
(the hardest biological substance known), and is the outer covering
of the tooth. It is a hard white (or off white) surface that protects
the teeth against bacteria and decay. Although it is a very hard
substance, it can be chipped or damaged and so lose its effectiveness
as a protective layer. Fluoride can replace calcium, making the
enamel even more resistant to dissolution in acid (from bacterial
action or sugars). Some toothpastes also advertise whitening agents
and polishing agents, which can whiten teeth, but only by removing
stains. Teeth come in all shades of white and cream.
Before toothpaste was invented people used to clean their teeth
with a variety of different items ranging from sticks to salt. Regularly
cleaning teeth prevents tooth decay and the addition of fluoride
in the toothpaste helps to protect the teeth.
Web links to visit:
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