The problem with a root tip abscess and most natural treatments is that the root tip is pretty well hidden down there in the jaw. Oil pulling works great for soft tissue issues, but this is an isolated, localized pocket of pus. Hard to get to.

Here is how they get it out surgically
[link to www.cuh.org.uk]

Back when they used silver points for root canals, the natual antibacterial effects of the silver helped keep this from happening. Does anybody still do silver point root canals?