go buy a new toothbrush with replaceable heads. brush your teeth until the original one is used beyond reason. then put a new one on it. then MAYBE your moth will be sanitary. god it's like you've been going down on your sister twice a day. ewww. incest via toothbrush.

If you had a normal regular toothbrush you wouldn't have this problem. Switch tooth brushes and buy the girl a vibrator. Problem solved. Or - what the guy above me said. Brilliant!

Oooh, damn!

hahahah omg gross.

omg i just sumbmitted a FML story about how my sister used her electric toothbrush as a vibrator and the next day i accidentally used her toothbrush that looked just like mine! haha then 5 seconds later i read this story and its like the samee1!

that totally sucks man IDK how the **** you deserve that you did nothing wrong. My parents are dentists and i don't have a sister so i doubt something like that's gonna happen to me. Use a good ol' toothbrush. IT helps you buff up your arms if it's heavy enough hahahaa

Buy her an electric toothbrush, then by you a regular toothbrush. You should probablly put a lock on it too just in case xD

LMFAO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! OMG. I laughed that hard in years.

LMFAO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! OMG. I laughed that hard in years.

Your sister needs a sex toy! WTF! I remember when I did that with my god mother's toothbrush! That's disturbing.

er...minty fresh..

What the F-ing hell is wrong with her You know now that you know her secret you can blackmail her for life