A vertical overbite is when the upper teeth overlap the lower teeth, while a horizontal overbite is when the upper incisors extend beyond the lower incisors, also known as a deep bite. This type of overbite can cause a variety of issues, including difficulty speaking, eating, and even breathing. It can also lead to jaw pain and headaches. Treatment for an overbite can include braces, retainers, and other orthodontic appliances. In some cases, surgery may be necessary.