Toothbrush
The toothbrush is an indispensable instrument
for the removal of plaque and food debris from
dental surfaces.
There are many types of toothbrushes that differ
in size, form, stiffness of bristles, and length and
array of tufts.
The ideal toothbrush doesn’t exist (Bergenholtz
et al. 1984), but various studies have shown that
a short-headed manual toothbrush and synthetic
bristles with rounded tips are more effective.
The SHORT HEAD has fewer tufts and is very functional because it can easily reach all areas of the mouth.
In fact, the fewer tufts present on the head of the toothbrush, the more effective it will be in removing
plaque.
SYNTHETIC BRISTLES (e.g. nylon, tynes) are the
best choice because they do not absorb water
and therefore remain stiff, whereas natural ones
tend to lose their original consistency and become
very soft, and, therefore, ineffective in removing
plaque (Bay et al. 1967).
Natural bristles have hollows in which bacteria
can colonize and furthermore, they do not have
rounded tips, which are, instead, indispensable
because they reduce lesions of the gingiva.


The longer a toothbrush is used, the more its signs
of wear increase, and its cleaning potential diminishes.
Due consideration should also be given to other
factors that determine the wear of the toothbrush,
such as the length and frequency of brushing,
the brushing force applied, and the quality
of the toothpaste. These factors vary a great
deal according to the individual, and any variations
will determine the rapidity with which the
toothbrush begins to show signs of wear.
The toothbrush must be replaced when it loses
its initial form and becomes matted.
As a general rule, even if the toothbrush is not
deformed, it is advisable to change it every two
and a half to three months, because in this lapse
of time, variations in the form of the bristle tips
can occur and this alteration reduces the effectiveness
of the toothbrush in removing plaque
(Kreifeldt et al. 1980, Massassati - Frank 1982).