Nutritional balancing does make the body clear out any lingering infections. If there is an infection from a root canal, the body will eventually clear it on a NB program. I had infections in my lungs and sinuses I was unaware of until they cleared, about 2 years in. I had several bronchial infections as a child; apparently they were still lingering in my body. I do recommend NB for tooth infections, but can't say how long it will take or what to do in the meantime, except for maybe the infrared heat lamp.