Is the problem of focal infection still a possible problem with dental root canal treatment?

Dental focal infection has been shown in the past to cause serious health problems such as certain cancers and arthritis later in life (all stemming from bacteria trapped in the base of the treated tooth).
Answer
The idea of focal infection was a concern years ago, but extensive scientific research has proved this theory to be false. unfortunately there are still some "biologic" dentists who espouse this theory and will extract perfectly healthy teeth and provide other unecessary treatment to unsuspecting individuals. these "biologic" or "holistic" dentists can throw around fancy scientific terms so it is easy to be confused by them.you can rest assured that root canal treatment in the 21st century is safe and effective.