Teeth that are protruding, crowded together or erupting out of position are clear indications that treatment is needed (View Examples). Less obvious signs are mouth breathing, frequent biting of the cheek or palate, speech difficulties, and thumb sucking that goes past 3-4 years of age. If teeth don't meet properly when the mouth closes, or if jaws make sounds or shift as they move, this may also indicate an orthodontic problem.