For me, the temp filling came out by itself in a few weeks. I used the opportunity to pull with oregano oil and swish around Colloidal Silver since it made direct contact with the interior of the tooth.
After a day or two of this, I bought some temp filling stuff from the drug store and have been using it ever since. At the time I was a few months from moving to a new city, so I thought I'd wait to have it done somewhere I could return if there were problems. However since buying a business on the east coast, I've been too busy to bother with a dentist visit, crown, etc.
You might do the same and wait for the temp filling to come out, and then disinfect it well with oregano oil (I'm sure there must be a Korean vendors website somewhere that sells it) and CS. Of course only add a few drops of OO (Olive-Oil) to some other oil you pull with.