The most applicable frequencies for abscessed tooth is the Bacterial Infections and Mycoses frequency set:
Bacterial Infections and Mycoses: 0.05, 0.37, 0.83, 2.50, 3.00, 73.30, 95.75, 175.00, 269.71, 355.08
Abscessed teeth are a product of Bacterial infections, however until the tooth is looked at by a dentist and ‘repaired’ to prevent bacteria reinfecting the abscess area, the problem may not disappear and reinfection will occur through food deposits that cannot be reached by toothbrush.
The Rife frequencies can eliminate the bacteria, but cannot prevent the daily ‘reintroduction’ of bacteria to the damaged tooth.
Specifically with Root Canals, use the above frequency set for 1 week to 10 days. If the gum beneath the tooth continues to swell and cause pain, the tooth must be removed, because allowing infections to remain under the tooth at the point of the jawbone for extended periods of time may cause infections within the jawbone itself. This could cause many many problems and surgical procedures with bone grafts to rectify.
Please do not take this type of infection lightly, as I have seen many of my patients sent to surgery due to leaving an infected root canal to fester for extended periods. Pain relief will only mask the problem, and antibiotics will have some positive effects, but often the daily reintroduction of bacteria, will cause the infection to resurface.
Consider pulling the infected root canal, and introducing an implant. There are new implants made from a diamond material called zirconium, or specifically zirconium dental implants. As I am an alternate medicine doctor, I am not an advocate of placing metals of any sort in the mouth, such as metal amalgams, titanium implants etc. Zirconium, being a non metal material, similar to gemstone or even rock, works more holistically with the body. If you choose the implant option with Zirconium, you will completely avoid the disastrous possibility of infection spreading to jawbone.