You need retainers because, without them, your teeth will move back out of alignment. Your orthodontist's work with Invisalign isn't at fault here. Rather, it's because your teeth have been in their misaligned positions for many years, and it takes a considerable amount of time to stabilize them in their new, correct positions. Retainers play a crucial role in the post-treatment phase, ensuring that the achieved results are maintained and preventing the teeth from reverting to their previous state. Initially, for the first six months to a year after your treatment, you'll need to wear them all the time. After this period, you can reduce their use to just a few nights each week. Regularly using a night guard can also be beneficial, as it helps to offset the natural tendency of teeth to shift over time. Why Vivera Retainers Are Used Post-Treatment: - Maintain the progress achieved with your Invisalign treatment. - Prevent your teeth from moving out of alignment. - Maintain the health and correct alignment of your bite. - Avoid the occurrence of spaces between your teeth.