If the horse tosses its head or attempts to evade contact with a bit, improper fit is usually the cause, but other factors should be considered. A rider needs to verify with a veterinarian that the horse does not have a dental problem. Then bit fit and the type of bit needs to be considered. But finally, the skills of the rider may be a factor. Even the gentlest bit properly adjusted may still cause discomfort to a horse in the hands of a poor rider.