Martingale will never work in the long term, neither in the short term I will think. There will always be that advantage to the house that will make them win sooner or later. Once you lose 5 time there is so much risk to just win a few bucks. Not fun either, I have way more fun playing BlackJack or Roulette. Try some different things because this method doesnt work, sooner or later you will hit a big losing streak.
And that is another problem of martingale it escalates very quickly and you need to bet more and more just to recover your money, if you bet one dollar as your base bet after losing 5 times you are risking 16 dollars just to get one dollar back, it is a system that puts more and more money at risk and while you could get your money back most of the time but the one time you don't will break you, and this applies to all games that have a negative EV, like roulette, craps, dice or
sports bets.