• Upper front teeth protrude excessively over the lower teeth.
• Upper front teeth cover the majority of the lower teeth when biting together (deep bite).
• Upper front teeth are behind or inside the lower front teeth.
• The upper and lower front teeth do not touch when biting together (open bite).
• Crowded or overlapped teeth.
• The center of the upper and lower teeth do not line up.
• Finger-or thumb- sucking habits which continue after six or seven years old.
• Difficulty in chewing.
• Teeth wearing unevenly or excessively.
• The lower jaw shifts to one side or the other when biting together.
• Spaces between the teeth.