L need a funny foke plz

Witch system has the main function of the body defense

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

Quick! will get brainliest which service do most community health centers provide? child care meal preparation medical research mental health treatment