This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
When scaling and root planning, the primary objective of the procedure is to 
Select and explain. 
A. Cause shrinkage of gingival tissue, B. Create glass - like root surfaces, C. Remove all cementum, D. Restore the gingival tissue to health
D: Restore the gingival tissue to health
Answer: D: Restore the gingival tissue to health 
Explanation: None