Dentinal Hypersensitivity

Dentinal hypersensitivity affects up to 74% of the general population*, depending on the specific study. It is experienced most in middle-aged patients, presenting as a sudden, sharp pain in response to stimuli (cold, hot, sweet or acidic foods and drinks, as well as cold air) that gradually fades away. Dentinal hypersensitivity, according to Brännström's theory, occurs when fluid moves within open and exposed dentinal tubules. This causes irritation of the adjacent nerve fibers and results in pain. These tubules may be open due to dentin exposure as a result of recession, abrasion, erosion or attrition.

*Miglani S, Aggarwal V, Ahuja B. Dentin hypersensitivity: Recent trends in management. J Conserv Dent. 2010 Oct-Dec;13(4):218-224.

Relief from Sensitive Teeth

Relief from dentinal hypersensitivity is obtained by blocking the tubules or by preventing the nerve fibers from transmitting signals causing pain. ARM & HAMMER Sensitive toothpastes contain the maximum level of potassium nitrate allowed in a toothpaste, preventing the transmission of pain. RDA testing demonstrated that ARM & HAMMER Sensitive toothpastes are 40% more gentle to dentin than the leading sensitive whitening toothpastes**, data below.

**Source: Nielsen data, Latest 52 Weeks, MAR2313, Total U.S. AOC, ranking based on Dollars.

Research Study

Ghassemi A, Hooper W, Winston AE, Sowinski J, Bowman J, Sharma N. Effectiveness of a baking soda toothpaste delivering calcium and phosphate in reducing dentinal hypersensitivity. J Clin Dent 2009;20(7):203-10.

The goal of this study was to assess the effectiveness of a baking soda dentifrice containing calcium, fluoride and phosphate in reducing dentinal hypersensitivity compared to a regular fluoride dentifrice. In this study, 208 subjects were randomly assigned to use one of the dentifrices twice daily for eight weeks, after which those using the test dentifrice then used the regular fluoride dentifrice for eight more weeks. Dentinal hypersensitivity was measured at baseline, four and eight weeks using the Schiff Thermal Sensitivity Scale (STSS) (air blast) and the Visual Analog Scale (VAS). For both dentifrices, statistically significant reductions in dentinal hypersensitivity were observed at weeks four and eight with both tests (p<0.0001). At week eight, a 58% reduction in dentinal hypersensitivity (STSS) was seen with the test dentifrice. The four-week and eight-week reductions observed with the baking soda dentifrice containing calcium, phosphate and fluoride were statistically significantly greater than for the fluoride dentifrice (STSS and VAS) (p<0.0001). After this test period, subjects then brushed with a regular fluoride dentifrice (containing no desensitizer) for eight weeks. Following this, the reductions in sensitivity that had been seen with the test dentifrice were still present.

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