If you don't do any PCT after a dbol cycle you will likely lose any gains you acquired from the dbol. Do some research, but you will need some nolvadex (tamoxifen) and/or some clomid. I would also consider something to help your test levels return to normal if needed.
You should also have your PCT lined up before you start the AAS...you should def have the nolva ready during the cycle in case you develop any gyno.