Try oil pulling with coconut oil every morning. Make it a part of your daily hygiene routine and your problem won’t return. I suspect you have a fungus lying dormant beneath plaque. When the plaque is disturbed by brushing the fungus is released and you have an outbreak. The oil pulling will kill the fungus as it is released and eventually remove all dormant fungus and plaque. You can google the methods of oil pulling. It has been done for hundreds of years. The key is consistency. Good luck.