An underbite is a dental condition where the lower teeth protrude beyond the upper teeth when the mouth is closed. This misalignment can affect a person's bite and may lead to difficulties in chewing, speaking, and maintaining oral hygiene. Underbites can be caused by genetic factors, thumb sucking, or prolonged use of pacifiers during childhood. Treatment for an underbite often involves orthodontic interventions, such as braces or retainers, to realign the teeth. In more severe cases, surgical options may be considered to correct the jaw position. Regular dental check-ups with a dentist can help monitor and manage this condition effectively.