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.
I was not able to find anything properly proving that proper tooth brushing cannot be achieved with a normal toothbrush. Dentists usually should tell you if you are brushing too hard or missing spots. If you follow this advice, the same amount of cleaning can be achieved without spending as much as you need to for an electric toothbrush.
And for the issue of brushing too short or too long. A toothbrush telling you is not better than just setting a timer but way more expensive…