The short answer is that yes, the purpose of braces is to provide you with straight teeth for life. However, it is not quite that simple but not a herculean task. If you do not properly care for your teeth and the braces structures 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. After your dedication to completing the treatment, you must ensure that the results last for a lifetime. To do this, you must follow instructions from Smile Centre on caring for your new smile.