Receding gums & damage to your enamel can expose thousands of microscopic channels which lead to your tooth's nerve centre. When your teeth make contact with something hot, cold or sweet, sensations are carried down these channels directly to the nerves, causing pain. Most other sensitive toothpastes primarily numb the pain. Colgate Sensitive Pro-Relief Enamel Repair works by blocking the channels that lead to sensitive tooth nerves for instant Relief. With regular use, it builds a reparative layer that acts like a seal, helping to repair sensitive teeth for lasting protection against sensitivity.