Oil of oregano is good for killing the bacteria, but like any other broad spectrum antibiotic, should not be used continuously for a long period of time. Hemp oil is good, as is any nut and seed oil that is unrefined. Coconut oil is antiviral, and contains lauric acid, which builds your immunities.
I would go ahead and use the hemp for a couple of weeks with the Oil of Oregano. Then change to coconut for awhile without the Oregano. Only use the oregano oil for a few days each month after that.
I had read (and am currently trying) IP6 on my teeth at night for re-mineralization.