The goal of clinical trial is to know the role clear aligner seater. The main question it aims to answer is to evaluate the use of clear aligner seater on the effectiveness of clear aligner therapy by questioning the predictability of proposed treatment plan.
* Group A (Regular-use group): Use chewy with the 1st insertion of each aligner sets for a day or a couple of days until the aligner seated well with no gap with the teeth. The patients will be instructed to bite on the chewy while the aligners are in position for few seconds.
* Group B (customized-use group): In addition to the regular use of the chewy, the participants will be instructed to bite for few seconds while the aligners are in their mouth at bedtime on a daily bases.