TePe brushes are just too big to get between teeth. I know because I wasted money on one once. That said, it wasn't until my teeth started gradually moving around, about a decade or so ago, that I was able to use 'normal' floss anyway. Most of my life it was near impossible to get it in and out to use it, or even to need to. I bought a water flosser not so long ago, but with no socket in the bathroom (sure now we all have RCD we ought not worry ?) and no decent shelf to place it handy, I've yet to get around to using it, months later.