Cheek teeth diastemata are the most common cause of quidding in the horse. They most commonly affect the most distal mandibular interdental spaces (09/10s and 10/11s) and they begin with impaction of food material, which may progress to gingivitis and periodontitis. They are diagnosed during a thorough oral examination, given under sedation. The initial assessment should include removal of the food from the diastema, which is also therapeutic. Many cases may be resolved by removing the impacted food and with good quality routine dentistry. Other proposed treatments include packing or stenting of diastemata, removing teeth from occlusion, diastema widening and extraction of cheek teeth.