Just like the question "how long is a piece of string" the answer depends. Everyone's oral health is different and everyone has their own healing capacity. Just like in the gut, your first job is to restore a healthy bacterial balance. Once that is done, now the body can start to function properly and begin to heal and repair. When your oral cavity is in dysbiosis (means an unhealthy bacterial balance) then your mouth is constantly under attack and your body is trying to fight back. As the bacterial balance is restored and rebalanced, now the body can devote more energy to healing–and the oral cavity renews. While this varies, most people start to see results after about a month, with strong results after 3 months or so.