OK, it's actually an electric toothbrush with different heads (we've moved to a another country for a few months and one got left behind accidentally). My dp maintains that the little coloured bands at the bottom of the brush distinguish one person's brush head from another,and that it's normal to share the electric handle, making sure your own head is on...
Is this normal?? Do families share electric toothbrushes like that? I am certainly not familiar with the custom 🙈