Why is cumulative risk a serious concern?

Which disease is caused by a buildup of plaque in blood ves

When a person undergoes root canal treatment or another endodontic treatment: [select all that apply] a.) the inside of the tooth is carefully cleaned and disinfected. b.) air is forced into the canal to stop bleeding. c.) the inflamed/infected pulp is removed. d.) the inside of the tooth is filled and sealed with a rubber-like material called gutta-percha

Which of these gives the best indication that a health service is based on pseudoscience?