Depending on how much space is required, , There may be some cases where insufficient space may still be an issue.
For example, when teeth are so crowded, they press up against each other and put each other under pressure. This pressure is relieved by creating space. Then the surrounding teeth may just move in to fill the space you’ve created. If this happens, you may need to create more space than originally planned. Otherwise the remaining movement will no longer have sufficient space, and treatment may go off track and the aligners no longer fit. In such cases more space is created by hand stripping/ Interproximal Reduction (IPR) or Case Revisions. Hand stripping - Needed space is created manually by using a diamond strip. Interproximal Reduction -The process of creating very small amounts of space between pairs of teeth in order to allow the teeth to move as needed during treatment. Case Revisions(if needed) - patient's treatment is re-staged to target the original treatment goal, starting from the current position.Read more Read Less
With a small amount of consistent pressure, through a series of trays in succession, teeth will move. But, some types of teeth, some movements, and some other factors may need more attention.
These include, Maxillary laterals - Most of the time Maxillary Lateral Incisors have issues with rotations, extrusions, and intrusions. Short clinical crowns - In this case visible portion of the tooth don't protrude from the gums very much and because of that the teeth are simply too small to hold an aligner in position. Premolars, Molars, Patient’s age - The age limit for younger patients has to do with when the last permanent teeth erupt. Usually, this would be around age 13.Read more Read Less