Ok we have 2DD and 2DS. They all have their own favourite colour for most things, laundry tubs, cups, towels etc etc, its our way of quickly picking up the right thing for the right child. I know my OCD taking control here 
So toothbrushes are all in their "own" colour
DD 10 purple
DS 8 yellow
DS 7 blue
DD 4 pink
Now the 2 DDs no problem at all they use their colour toothbrush. The 2 DSs no chance, they have always had the same colour toothbrush, they are even named (due to this problem) but NO everytime I get to the bathroom they are swapping toothbrushes left right and centre.
AIBU or is using your own toothbrush just to hard for 8 and 7 year old boys !!!
I know in the grand scheme of things it's not a big issue but errgh I wouldn't want to use someone elses toothbrush and it is really beginning to wind me up.
Anyone any tips on how to stop this annoying habit of theirs? How do you other large families get around toothbrush issues?