Local Anesthetic Agents Are Not Effective When Injected into an Area

Multiple Choice

Local anesthetic agents are not effective when injected into an area where a tooth or soft tissue is infected because:

A) increased swelling in tissue dilutes the anesthetic.
B) an increase of lymphocytes, in the area to combat the infection, will interfere with the effectiveness of the anesthetic solution.
C) increased blood flow in an area of infection rapidly carries the anesthetic away from the area.
D) the infection causes local temperature to rise above the point where local anesthetic is effective.