The answer is usually between 4-5 years (following the incisors). *IF* the bridle teeth (canines) are going to come in on a mare.
I didn't have a clue, and I might very well have a poor source of info. This is the source my info came from.. Actually one of two sources...
(Equineestates.com/library/caredental) - 0r something like that
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A mare may have between 36-40, because mares are less likely to have canine (bridle) teeth.
The following chart shows the approximate ages at which different teeth erupt. By referring to it, you may detect potential abnormalities of your own horse associated with teething.
Deciduous (Baby Teeth)
1st incisors (centrals) Birth or 1st week
2nd incisors (intermediates) 4-6 weeks
3rd incisors (corners) 6-9 months
1st, 2nd & 3rd premolars Birth or first 2 weeks for all premolars
(cheek teeth)
Permanent (Adult teeth)
1st incisors (centrals) 2 ? years
2nd incisors (intermediates) 3 ? years
3rd incisors (corners) 4 ? years
Canines (bridle) 4-5 years
Wolf teeth (1st premolar) 5-6 months
2nd premolars (1st cheek teeth) 2 ? years
3rd premolars (2nd cheek teeth) 3 years
4th premolars (3rd cheek teeth) 4 years
1st molars (4th cheek teeth) 9-12 months
2nd molars (5th cheek teeth) 2 years
3rd molars (6th cheek teeth) 3 ? -4 years