Hi, crooked teeth are better treated with fixed braces if you are satisfied with your shape and colour of your teeth. Another alternative option for fixed braces can be transparent removable alliners in most of the cases but it is a bit expensive. They can be easily removed at special occations and are not much visible as normal braces do.
Other options can only be work out by seeing clinical snaps and opg xrays. Take care.
Depending on how crooked the teeth are there can be a few options besudes braces treatment. But let me warn you that most of them are cosmetic treatments and will involve removal of some enamel structure or even root canals ans capping in extreme crowding cases. Also it may or may not be feasible in all cases. A picture of your smile with all teeth showing would give a better idea. Options include veneer ( minor crowding ) , crowns and root canals if the alignment needs major corrections. The fact remains that braces although time consuming will remain the moat natural way to correct your crooked teeths alignment.