Your patient, Zoe Williams, presents with dentinal hypersens…

Your patient, Zoe Williams, presents with dentinal hypersensitivity on all posterior teeth. You notice some moderate to advanced recession in these areas. Upon questioning the patient, she tells you she brushes with a hard bristle toothbrush and uses a dentifrice which contains baking soda. What active ingredient contained in a product is most effective for this patient to use to alleviate some or all of the hypersensitivity?