Brushing time turns into a standoff every night, and it's not your kid's attitude. Here's why:
Kids under seven can't feel two minutes.
Time is invisible to them — "keep brushing" is an instruction with no finish line. So they stop when it feels done, which is about eleven seconds in, and no amount of repeating yourself teaches a child to sense duration.
Every fix so far has needed you in the room.
The phone timer is your phone. The sand timer needs you to flip it, watch it, and fish it out of the sink when it gets knocked over. The singing timer worked — until the fourth week of the same twelve songs, at full volume, twice a day. None of them ever took you out of the loop.
Nagging makes the routine worse, not better.
The more brushing becomes a thing you enforce, the more it becomes a thing they resist. You've felt it: the routine that should take four minutes takes fifteen, and everyone ends it annoyed.
It isn't that your kid won't brush.
It's that nothing at the sink shows them what two minutes looks like — without you standing there.