Aligners and/or teeth can also feel loose during various parts of the treatment as teeth move. Sometimes your bite may also be affected for a while. This is normal. Chewies may help seat aligners better. In some people the teeth move very quickly for each and every set of aligners. In those cases, it may be possible to change your aligner schedule. Please contact Customer Support before making any changes. Overall, your teeth may shift in various ways over the course and as part of the designed treatment. This may include temporary extra crowding, spacing and looseness, as your teeth are adjusted to get them to where they need to be in the end . By the final step of your treatment your smile should be as displayed in your 3-D Treatment Plan images.