S. Salivarius that is used in KFORCE is naturally occuring in the mouth of all humans. Unfortunately chronic halitosis people have changed the bacteria composition of their mouth, and have killed it off. The KFORCE puts the bacteria back in the mouth that you originally had. So it is safe to use for a lifetime.
Yes it is ongoing, but you are already using so many mouthwashs, you should be more concerned about their long term effects.
GSE has been shown to have no antibacterial properties, and even if it did, the issue is that the bacteria in the mouth would adapt to it, and it therefore becomes ineffective.
The idea of using the KFORCE bacteria is that they all come from the original discovered bug, they are not genetically modified, and each time you place them in the mouth, they are new to the environment so there can be no resisitance.
The other probiotics you are using are stomach bacteria and cannot live properely in the mouth.
Please read the information on the website to learn about this discovery.