In this maloclusion in a dog the left lateral incisor has been traumatizing the mandibular canine tooth since the teeth erupted.  Note the size of the root canal in the affected tooth vs. the normal canine on the other side.  The dentin stops growing in teeth when they lose vitality causing this incongruity.  The treatment of choice in teeth like this is either root canal therapy +/- crown placement or extraction.  Due to a likely open apex and severe periapical changes noted by the bone lucency at the root tip this tooth was extracted.

Brett Beckman, DVM, FAVD, DAVDC, DAAPM
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