The short answer is that yes, the purpose of clear aligners is to provide you with straight teeth for life. However, it is not quite that simple but not a herculean task. While clear aligners help straighten them, if you do not properly care for your teeth and the clear aligner structure while wearing them, then the above answer is not suitable for you.
Once your teeth are straight, it takes time for the bone and tissues to settle down and stabilize. It can take a year or even longer for these tissues to become fully stable and if your teeth were significantly repositioned, the time required might be even longer. After your dedication to completing treatment successfully, you will want to ensure that the results of treatment last for life. To do this, you must follow instructions from Smile Centre on caring for your new smile.