Toothbrush heads

My wife bought new toothbrush heads on her way home from work today.

They didn't fit. She bought the "Oral B IO" heads, but we have a "regular" Oral B toothbrush, not the Shiny Fancy IO design.

And this is after she bought replacement heads last week at another store -- which turned out to be "compatible for" a different brand :(

Ugh.