I do not wish to say the brand name of tin I used, but perhaps the second picture below will give you a clue. /\
Step 1: Step 1: Stuff you need...
A metal hinged breath-mint tin
A cheap toothbrush
A small roll of dental floss
A tiny tube of toothpaste
A gauze pad
Step 2: Step 2: Trim toothbrush to size
It should look like the picture below.