A horse grazes with a grinding sideways motion for many hours a day, and the teeth erupt slowly throughout life to replace what that grinding wears away. When the upper and lower rows do not meet evenly, sharp points and ridges form, chewing becomes inefficient or uncomfortable, and problems can develop quietly in a mouth few owners ever see inside. Regular examination by a veterinarian or a qualified equine dental professional is how those changes are found early, and what the examiner hunts for changes as the horse ages.
Young horses: a mouth under construction
Between roughly two and five years old a young horse sheds two dozen baby teeth and erupts the full adult set, so the mouth is changing shape month by month. Checks during these years look for retained caps, the baby-tooth remnants that sometimes sit on top of erupting adult teeth, for wolf teeth that may interfere with a bit, and for uneven eruption that sets up wear patterns early. With so much moving, youngsters are often examined more frequently than settled adults, commonly around twice a year, though the exact rhythm is one to agree with your own professional. Owners can help by noting reluctance to accept the bit, head tossing that is new, or feed being dropped while the youngster eats, and by reporting those observations at the visit rather than waiting to see whether they pass.
Settled adults: maintenance and wear patterns
Once the adult mouth is complete, examinations focus on the consequences of grinding: sharp enamel points along the cheek teeth, ramps or hooks at the front and back of the rows, and wave-like unevenness that restricts the sideways jaw movement chewing depends on. Many adult horses in regular work are checked about once a year, with the interval adjusted for the individual mouth, workload and history. Between visits, the owner's evidence is behavioural: partly chewed balls of hay dropped in the stable, slower eating, grain spilled from the mouth, weight drifting down despite a full ration, or a new resistance to rein contact on one side. Each of those signs is a reason to bring the next check forward rather than simply waiting for the calendar to arrive.
Senior horses: wear, looseness and gaps
In older horses the equation reverses: teeth have less reserve left to erupt, surfaces wear smooth and lose grinding efficiency, and individual teeth may loosen, fracture or be lost altogether. Gaps between teeth trap fibrous feed, gums recede, and chewing long forage becomes harder work, so examinations often move to a closer rhythm again, frequently twice yearly for horses showing their age. The examiner also weighs how the mouth affects the whole horse, discussing forage length, soaking or alternative fibre forms when chewing is compromised, and watching body condition alongside the dental findings. Owners of seniors should track eating time honestly, since a horse who stands at the hay net for hours may be working hard for very little intake.
Agreeing the rhythm and keeping the record
Treat frequency as a pattern you set with your vet or dental professional and review as the horse changes, not as a fixed calendar an article can hand you. Ask at each visit what was found, what was corrected, what is being monitored and when they want to see the horse again, and write those answers down before you leave the yard. A mouth history that travels with the horse helps any new professional enormously, particularly for horses bought with no records at all. Dated examination findings, charts and next-due notes can all sit in Pet Passport from KinsLe, creating a dental timeline that follows the horse through every home.