Neural action of potassium nitrate and occlusive sodium fluoride. Potassium nitrate is an effective agent in the treatment of hyperesthetic dentin. Its action is based on the fact that the increased concentration of extracellular potassium depolarizes the membranes of nerve fibers, blocking the passage of the stimulus, reducing hypersensitivity. Calcium Prevents demineralization and reduces hypersensitivity. Quickness Shorter daily wearing time. • 7.5%: 1 hour a day. • 10%: 30 minutes a day.