Question: A client is using a toothpaste with postassium nitrate. What is the role of the potassium nitrate in this toothpaste? Need Assignment Help? Question options: potassium depolarizes the nerve fiber and prevents pain signals from travelling to the brain. potassium neutralizes the nerve fiber and prevvents pain signals from traveling to the brain. potassium acts on the smear layer to decrease pain receptors potassium decreases the cold stmuli to the pulp