Every horse has six teeth above and below; before three years old he sheds his middle teeth; at three he sheds one more on each side of the central teeth; at four he sheds the two corner and last of the fore-teeth.

3701. Between four and five the corse cuts the under tusks; at five will cut his upper tusks, at which time his mouth will be complete.

3702. At six years the grooves and hollows begin to fill up a little; at seven the grooves will be well-nigh tilled up, except the corner teeth, leaving little brown spots where the dark brown hollows formerly were.

3703. At eight the whole of the hollows and grooves are filled up.

3704. At nine there is very often seen a small bill to the outside corner teeth: the point of the tusk is worn off, and the part that was concave begins to fill up and become rounding; the squares of the centra) teeth begin to disappear, and the gums leave them small and narrow at the top.