Although I have not witnessed this myself, so I cannot attest to the validity of this...Thieves essential oil blend has been reported to help reverse cavities at the beginning stages. I am not certain this is accurate, but may be worth a shot in a poo hits the fan scenario. I have also heard that fresh whole milk swished several times a day may do the same. Again, I cannot attest to that report either. Thieves is a great antibacterial blend. I don't see how it could rebuild enamel though. I would definitely be cautious of filling a cavity long-term without getting all the yuck out of it first.