Names of the Teeth 53 
in mares, but are usually small and not well developed. 
In a complete set of teeth, the mare has thirty-six, and 
the horse forty. Small, extra molars are sometimes 
found in front of the first molars on the upper jaw, 
(rarely on the lower), commonly ealled “wolf teeth.” 
The molar teeth are distinguished by numbering 
them from before backwards, and by using the terms 
right and left,—as, the third right upper molar. The 
incisor teeth are named according to their position: the 
two teeth occupying the middle are called the central 
incisors; one on either side of these is called a lateral 
incisor ; the two outer ones, one on either side, are 
ealled the corner incisors. 
A horse has two sets of teeth. The temporary, or 
“milk” set, twenty-four in number, consists of twelve 
incisors and twelve molars. There are three incisors 
and three molars in each half of each jaw. These dif- 
fer from the permanent set described above by being 
smaller, whiter, and having a well-defined constriction, 
or neck, at the gum. 
The temporary teeth in colts are erupted, or “cut,” as 
follows: At birth a colt has three temporary molars on 
each jaw and the two central incisors or “nippers.” 
They may be covered by thin skin, which breaks within 
a day or two. The lateral incisors on both jaws are 
erupted at four to six weeks, and the corner incisors 
at six to ten months. Thus, at one year old the colt 
has a full set of twenty-four temporary teeth. 
The temporary incisors are replaced by permanent 
teeth, as follows: The two central incisors are shed at 
about two and a half years, and the permanent ones 
