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8 THE TREATMENT OF TEETH

as is usually the case, one or more decayed teeth
are found on the same side of the face as the tooth
to which the pain is referred, the treatment of one
or more of these teeth will give relief. Pain caused
by one decayed tooth may be referred to any other
tooth in either jaw on the same side of the face as
the affected tooth, but it is extremely rare for it to
pass the median line ; thus the writer has known
pain caused by a left lower wisdom tooth to be felt
in a left upper central incisor, but has never
known a tooth on the left side (either upper or
lower) to cause pain on the right side, and vice
versd. Frequently the pain is referred to one of
the branches of the fifth nerve, and is then termed
neuralgia. The pain is usually felt under or over
the eye ; in the temporal region ; in and under
and in front of the ear ; running upwards to the
temporal region, or downwards to the shoulder
and arm.
Pain under or over the eye usually points to
upper teeth being affected ; while pain in or about
the ear, particularly if the pain is at the back of
the ear, or shoots downwards, points to lower teeth
" while pain over the parietal eminence, to trouble
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from either upper or lower teeth."
In these cases the condition of the decayed teeth
1 Smale and Colyei\