How do sensitivity toothpastes remedy effects of tooth erosion?

Underneath both the enamel and the cementum is dentin. Dentin is less dense than enamel and cementum and contains microscopic tubules (small hollow tubes or canals). When dentin loses its protective covering of enamel or cementum these tubules allow heat and cold or acidic or sticky foods to reach the nerves and cells inside the tooth. Dentin may also be exposed when gums recede. The result can be hypersensitivity.

Toothpaste for sensitive teeth contains compounds that help block transmission of sensation from the tooth surface to the nerve, and usually requires several applications before the sensitivity is reduced. Sensitive teeth can be treated. 
Toothpastes designed for people with tooth sensitivity work to numb the nerves that cause the pain. Many of them have potassium compounds that change the way the nerves respond to stimuli, or they contain strontium chloride which creates a protective film over the tooth to relieve sensitivity.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.