Final answer:
The toothpaste not recommended for someone with dentinal hypersensitivity is one with a high RDA value, which is too abrasive and could worsen the condition. Toothpastes designed for sensitive teeth often contain strontium chloride, potassium nitrate, arginine, and CSPS, and those with a lower RDA value are preferable.
Step-by-step explanation:
The toothpaste that should NOT be recommended for a client with dentinal hypersensitivity is the one with a high RDA (Relative Dentin Abrasivity) value. Toothpastes formulated to reduce sensitivity often contain active ingredients like strontium chloride, potassium nitrate, arginine, and calcium sodium phosphosilicate (CSPS). Studies have shown that toothpastes combining arginine and CSPS can be particularly effective. However, if a toothpaste has a high RDA value, it can be too abrasive and could worsen dentinal hypersensitivity.
Therefore, toothpastes with a lower RDA value, ideally no higher than 50, should be recommended for daily use by people experiencing sensitive teeth. The flavor of the toothpaste, such as peppermint, spearmint, or wintergreen, generally doesn't impact sensitivity, nor do specific remineralizing agents like hydroxyapatite nanocrystals and various calcium phosphates.