On She Built It®, Brynn MacLennan, product designer, mother of five, and co-founder of Slate, shares how co-managing a dental practice revealed something that couldn’t be unseen: even wealthy, educated patients weren’t flossing. Not because they didn’t care about their health, but because flossing was broken.

Brynn shares how she turned that insight into a patented 3-in-1 electric flosser now sold in 870 Target stores, what it took to hit $1M in year one, and the marketing strategies that actually moved the needle, including why dental professional influencers outperform lifestyle influencers for Slate every time. She also talks about the leadership evolution of letting go, the books that changed how she builds her team, and why she thinks founders need to talk more openly about failure. This conversation is for any founder who started with a problem no one else thought was big enough, and turned out to be right.

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Slate Flosser LinkedIn

Slate Flosser Instagram

Brynn MacLennan LinkedIn

Brynn MacLennan Instagram

The Day I Realized Oral Health Wasn’t Just About Teeth | Brynn MacLennan | TEDxSpokane

Work with She Built It® Media

She Built It® Instagram

She Built It® CEO, Melanie Barr Instagram

Melanie Barr LinkedIn

She Built It® LinkedIn

Episode resources:

OuterSignal — Know Every Customer

Claude AI

Multipliers, Revised and Updated: How the Best Leaders Make Everyone Smarter by Liz Wiseman

Who Not How: The Formula to Achieve Bigger Goals Through Accelerating Teamwork by Dan Sullivan