Enzymes are proteins that quicken chemical reactions to function as biological catalysts. Enzymes can interact with molecules known as substrates, and they change the substrates into other molecules known as products. Enzyme catalysis is required for nearly all of the metabolic activities in a cell to proceed at speeds quick enough to support life.Enzymes are required by metabolic pathways in order to catalyze specific steps. Enzymology is the study of enzymes, and pseudoenzyme analysis acknowledges that some enzymes have lost their capacity for biological catalysis during evolution.This book focuses on its role in Periodontics.