Yes u cn do smile designing.the only disadvantage is that ur natural tooth Wil be trimmed to accommodate the cap,as long as u maintain a good oral hygiene it will b fine.its less time consuming too when compared to braces,there won't be any issues as long as Ur teeth are good and sound ,or if u want to do it n a natural way then u shd get the help of a good Orthodontist again,and remv the root cause.

Hello , As you already stated that orthodontic treatment was performed there is a possibility that it has relapsed , if that is the case you can visit an orthodontist . If you want to get crowns done for getting your smile corrected , there isn't any harm in that either however, getting a crown on a tooth means reducing the tooth from all sides in order to make the crown sit in the position . There are no side effects to the treatment .