Fig. 1. EOTRH-affected horses showing 25-gauge needles inserted into the occlusal aspect of the pulp chambers, indicating pulp expo- sure (white arrows) and discolored teeth 101 and 201 (red arrows).
Fig. 3. EOTRH-affected horse with gingival edema and recession (white arrow) and resorptive lesion at the gingival margin (red arrow).
Fig. 4. EOTRH-affected horse showing pathological tooth frac- ture (red arrows), pulp exposure (white arrows), and gingival recession (yellow arrows) with bulbous enlargement of the reserve crown and roots.
Fig. 2. EOTRH-affected horse with gingival edema and hypere- mia with multiple suppurative gingival draining tracts (white arrows).
owners. Some EOTRH-affected horses will be reluc- tant to have their mouth examined as part of a physi- cal examination and are better examined after seda- tion is administered. Tapping on the incisor teeth with a metal instrument or similar can produce a marked response (compared to an unaffected horse);
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this can be done before or after sedation is adminis- tered. A “carrot test” can also be utilized, but this must be performed before the horse is sedated. The carrot test as termed by Dr. Chris Pearce, Equine Dental Clinic, UK, shows affected horses reluctant to bite a crisp carrot with their incisors and instead pre- fer to grasp the carrot with their lips to draw the car- rot into the oral cavity to masticate using cheek teeth.