You can, but you can get very tired and it could be quite uncomfortable as you have to deal with pain from extraction and the pain from the bonding of brackets, which is the ulcer and all that.
Subsequently, pain from the effect of teeth moving, it's almost having everything all at one go.
Some people opt for that as they think that they would just take a few days off work and be done. We also know teenagers can cope with this a lot better, they tend to heal very well. To them, extraction is simpler so the recovery is less painful. It definitely does depend on the individual as well.
