It really is dangerous, it leads to chasing your losses, if it's your bad day accept it as it is, if it's your lucky then learn how and when to stop,
each day is very much different from the other day, take every game as it is don't try to win it's a luck based game, don't try to fool yourself that you can win by extending your roll, learn when to stop and how to stop
I'm following Martingale strategy which will be getting me profits only if I am extending my rolls; I mean even I am looking like out of control, I am still in control over my gambling and this way if I keep trying then I may get chances to recover my losses and also will get into profits. So, it is not only about when to stop but it is all about how you are approaching in calculated manner.
But, there are big differences between practical things and what we are having in paper/theory. Martingale strategy might be looking like giving you opportunities along with control but when you keep doubling your base bet, you may go running out of your bankroll that is the big problem of Martingale strategy. Now please tell me, how you will have control over your bankroll when you keep needing to double your base bet beyond your bankroll.
So, all strategies are not actually giving you control hence you must have your own control. After certain level of losses or profits, you must decide where to stop and when to resume and definitely not your strategy.