Majedeh Mazrai

Majedeh has spent her career inside the formulas that millions of people reach for every morning. As a formulation scientist at Sensodyne and Aquafresh, she helped shape products that defined how the category cares for sensitive teeth and enamel — the quiet, exacting science that turns an idea in a lab into something that works on a brush.

Her expertise is in the hardest part of oral care: making complex actives behave together. A triple-active formula is far more demanding than a single one – it means getting potassium nitrate, nano-hydroxyapatite and biomimetic hydroxyapatite to perform at clinically meaningful levels, in one
stable paste, every single day.

Majedeh is the brains behind S3's patent-pending S3 Repair Technology™, which she perfected after 3+ years and 31 formula iterations. This is the breakthrough the category has been waiting for.

At S3, Majedeh leads formulation. After years inside a category built largely on single-active solutions, S3 let her build the formula she always believed sensitive teeth actually needed – one that calms, strengthens and protects at once. The science that proves it is the science she has spent her career perfecting.