I am not a dentist but I can tell you that the operative word here is " trapped ".If it is in an area that gets no blood supply, no oxygen and is totally encased by non living tissue, it is not likely to kill it.
Here is what Jim says in his BooK #2 Page # 17
"Abscessed teeth, infected gums, and pyorrhea: use 6 drops in a glass,
add ½ teaspoon of vinegar or lemon, or lime, wait three minutes and
add ¼ glass of water. Use this solution to brush the teeth. Use a
new solution every morning. Do not leave this solution in the mouth
for longer than 60 seconds. Expect the pain of an abscessed tooth to
be overcome by the immune system in about four hours. Expect all
infection and all pyorrhea to be gone in one week. Expect all loose
teeth to be rock solid in two weeks. Expect a completely healthy
mouth in less than three weeks. Keep in mind that the Miracle-Mineral-Supplement solution
is the most powerful health solution ever developed and it will indeed
do exactly what is described here.
There are exceptions, of course. In the case of an abscessed tooth
where the abscess is inside the tooth and the Miracle-Mineral-Supplement cannot reach it
through a hole or some other way, the Miracle-Mineral-Supplement will not then handle the
abscess. It will have to be pulled."