Dental problems

• Irritation of the gums, which can be caused by sharp seeds, other food caught between the teeth, swelling from injury, weak tissue which is found in older horses, or irritation from equipment.
• There may be tartar buildup, which is usually found on the canine teeth. Usually pellets and mashes do this, grass and hay don't tend to.
• Lampas which is where there is swelling of the fleshy lining of the roof of the horses mouth, this is more common in younger horses who are not yet used to hard feeds. This usually is not a very big problem.
• Tongue injures, there may be bruises and cut on the tongue which could be caused from the horse biting their tongue accidentally, this could cause serious bleeding. 
• Retained caps, this is when aged baby teeth do not detach properly as permanent teeth come in, this may cause swelling of the gums, pain, and even a sinus problem.
• Uneven or sharp edges, if there are sharp edges the points may jab into the horse flesh in the mouth. This may cause swelling.
• Losing teeth, obviously horses will loose teeth with age, but it sometimes could cause a problem. Most teeth will deteriorate and fall out on its own, if there is a problem call the vet.