This is someone who should have been taught proper tongue posture as a child. Tongues are very strong muscles that can move teeth. If a person learns proper "tongue and lip" posture when they are young, the teeth can erupt fully. If the tongue is kept over the side teeth it blocks the teeth from growing in fully, and can even push the teeth further apart. Tongues can also create spacing between teeth.
Dr. Okun takes the time to review proper "tongue and lip" postures with all of her patients. This way the teeth can be brought to -and retained in- a favorable position for life. Its never too late to invest in that beautiful smile!