The treatment time often is determined by how complex the movement of the teeth is. In most cases, Dr. Liao can finish the case in about 10 months. For a mild crowding and gapping case, we can usually complete it in about 6 -7 months. We also offer teeth movement acceleration technique to cut the treatment time by halve. Many people start seeing a difference in their teeth within two to three months of starting to use the aligners.