How does this toothpaste reduce tooth sensitivity?

Rubella Beauty Dental Sensitive Fluoride Toothpaste uses calcium chloride as its primary desensitising active. When dentine becomes exposed — often due to gum recession or enamel wear — microscopic channels called dentinal tubules remain open. These tubules run from the tooth surface toward the nerve, and fluid movement inside them triggered by cold, heat, or acidic foods causes the brief, sharp sensation known as dentine hypersensitivity. Calcium chloride works by helping to narrow or occlude these open tubules, reducing fluid movement and therefore the nerve stimulus. This is a cosmetic, cumulative effect: consistent twice-daily brushing builds and maintains the occlusion over time. It does not "numb" the nerve or repair structural damage. For noticeable reduction, use it as your regular toothpaste for at least two to four weeks. If sensitivity persists beyond that, or if it is spontaneous (occurs without a trigger), worsens, or is localised to a single tooth, consult a dentist — these signs may indicate decay, a cracked tooth, or other issues that a cosmetic toothpaste cannot address.