Clear aligners cost more than metal braces or clear braces. The cost to the orthodontist or dentist for buying clear aligners is significantly higher than for braces.
Aligners are made by one of several companies and sent to the dentist ready to use with the entire treatment built-in. For longer treatments there can be one mid treatment adjustment with no added charge. If a second course correction needs to be made, there are additional charges for the new aligners.
Braces can have multiple course corrections as needed, usually with no additional cost. The orthodontist makes changes as needed. With aligners, new aligners need to be made for each correction.