Dentist Horse Anatomy Chart

Anatomy Horses evolved as grazing animals and their teeth are perfectly adapted for that purpose.

The front teeth, called incisors, function to shear off grass. The cheek teeth have wide, flat graveled surfaces that grind the feed to a mash before swallowing. 
Like humans, horses get 2 sets of teeth in their lifetime. The first baby teeth may erupt before a foal is born. The last baby teeth erupt at around 8 months of age. The baby teeth begin to be replaced by adult teeth at around 2.5 years. 
By age 5, most horses have all of their permanent teeth. An adult male horse has 40 permanent teeth. A mare may have between 36-40 teeth because mares are less likely to have canines.

Chart showing approximate ages at which different teeth erupt:
 Baby teeth:
1st incisor: birth to 1 week
2nd incisor: 4-6 weeks
3rd incisor: 6-9 months
1st, 2nd, and 3rd cheek teeth: birth to first 2 weeks
Adult Teeth:
1st incisor: 2.5 years
2nd incisor: 3.5 years
3rd incisor: 4.5 years
Canines: 4-5 years
Wolf teeth: 5-6 months
1st cheek teeth: 2.5 years
2nd cheek teeth: 3 years
3rd cheek teeth: 4 years
4th cheek teeth: 9-12 months
5th cheek teeth: 2 years
6th cheek teeth: 3.5-4 years.