A horse's teeth never really finish changing. Unlike ours, they keep erupting slowly through most of the horse's life to replace what grinding wears away, and the chewing motion that keeps them working also works against them. That is why dentistry in horses is not an occasional repair but a standing appointment — and why the answer to 'how often' depends on the horse's age and mouth, with a firm floor underneath it.
Why horses' teeth keep causing trouble
A horse chews in a wide circular sweep, but the upper jaw is broader than the lower, so the cheek teeth do not meet edge to edge perfectly. The unopposed outer edges of the upper teeth and inner edges of the lower teeth escape the grind and grow into sharp enamel points. Those points slice the cheek and tongue with every mouthful, and the horse adapts silently: eating more slowly, chewing on one side, soaking hay to soften it, dropping half-chewed balls of forage called quids. Hooks can form at the front and back of the tooth rows and interfere with the bit, and in older horses teeth loosen, wear down to smooth stubs that cannot grind fibre properly, or develop gaps that trap rotting food. None of this is visible from outside the mouth, which is precisely why the check exists.
What the yearly check involves, and why yearly is the floor
At a proper check — by a vet, or by a qualified equine dental technician working within their recognised scope — the horse is usually sedated so a full-mouth gag can be fitted safely and every tooth, right to the very back, can be seen and felt. The examiner raspes down sharp points, removes hooks, checks for loose, broken, or infected teeth, looks at the tongue, cheeks, and bars for ulcers and scars, and records the state of the mouth. Once a year is the standard interval for a healthy adult because a year is roughly how long it takes points to rebuild into a problem; leave it two or three years and the mouth the examiner meets is a renovation rather than a maintenance job, sometimes with ulcers that have been cutting the horse at every meal for months. Many owners tie the appointment to the vaccination visit so neither gets forgotten.
Horses that need twice-yearly checks
Young horses change mouths fast. Between roughly two and five years old they shed two dozen baby teeth — caps — and erupt their permanent set, and a retained cap sitting crookedly on a new tooth causes pain, head-shyness, and eating problems that look like naughtiness. Six-monthly checks through these years catch caps before they cause trouble and confirm the new teeth are coming through level. At the other end of life, seniors need the same frequency: ageing mouths develop gaps, loose teeth, and a wave pattern of uneven wear, and an old horse who starts losing condition in winter very often has a mouth problem that a twice-yearly check would have caught in spring. Horses with known issues — a missing tooth, a history of infection, parrot mouth or other conformational faults — belong on the twice-yearly list too, on their vet's or technician's advice.
Signs the mouth cannot wait for the diary date
Book a check whenever you see the evidence, regardless of when the last one was: quidding, weight loss or a horse who takes forever over feed, long fibres and whole grains visible in the droppings, one-sided chewing or a tilted head at the bucket, new resistance to the bit or head-tossing under saddle, bad breath, dropping feed, or a swollen face. Keep the findings from every check — what was rasped, which teeth are wearing thin, what to watch — recorded in the KinsLe Pet Passport alongside the date booked for the following visit, and dentistry becomes a managed routine instead of an emergency discovered at the feed bin.