It depends on what is the goal to be achieved through composite bonding.
If the goal is to improve tooth shape, then alignment should be considered in tandem. It may be helpful to correct the shapes of the teeth by using transitional composite bonding to guide optimal bracket placement. This also ensures that as the teeth straighten, the smile looks better instead of looking jagged due to the worn edges.
If the goal is to align the teeth without moving them, then composite bonding can be used alone [1]. However, this may create areas that are difficult to clean and since optimal spacing has not been created (by leaving the crowding as is), the final result may not look as good because the teeth proportions may not be ideal.
References:
1. Prabhu R, Bhaskaran S, Geetha Prabhu K, Eswaran M, Phanikrishna G, Deepthi B. Clinical evaluation of direct composite restoration done for midline diastema closure - long-term study. Journal of Pharmacy and Bioallied Sciences. 2015;7(6):559. doi:10.4103/0975-7406.163539
