This question holds many variables. If you part your hair down the middle once in a while, then you really should not worry about leaving a permanent part. If you part your hair down the middle and have been doing so for months, or even years, you may find that it is hard to get rid of that part regardless if your hair is wet or dry. You have trained your hair to fall in a certain direction.

The best way to get rid of your part is to style your hair in ways that fill up your part and to do so for more than a month or so. This routine of brushing or combing your hair in a direction that is opposite from your part, should help.