You asked about oral hygiene, not freshening your breath, so let me suggest that you consider hydrogen peroxide. It has a 16 letter name but is a really simple chemical, H2O2. To kill germs with a product such as Listerine you have to swish it around in your mouth for a minute or so.
Hydrogen peroxide directly oxidates organic compounds such as those in bacteria. It foams when it is killing bacteria. Put a little in your mouth and pretty soon you will have no liquid, only foam and a lot of dead bacteria.
The drawback is that it is very peppery tasting and I doubt that you would be comfortable using it every 15 minutes.
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