What causes sensitive teeth? Gum recession and damaged enamel can expose thousands of microscopic channels, called dentinal tubules, that are connected to the nerve endings of the tooth. When teeth come into contact with hot, cold, or sweet substances, these sensations are transmitted through these tubules directly to the nerve endings of the tooth, causing pain. How does elmex Sensitive Professional work? - elmex Sensitive Professional occludes the channels connected to the nerve endings of the tooth, blocking the pain. - With regular use, it forms una a long-lasting protective barrier that acts as a "sealant" against sensitivity. Ask your dentist/hygienist. elmex Sensitive Professional Exclusive Pro-Argin formula: the effective technology that dentists use with their patients to relieve dental sensitivity