Suddenly 'brushing twice daily' doesn't sounds so bad! The 'Tingle Tip' from LoveHoney fits directly over your Oral-B electric toothbrush and uses patent-pending technology to deliver some rather pleasing vibrations. To enjoy, simply remove the brush tip of your electric toothbrush, and replace it with the 'Tingle Tip'. It's made completely of plastic, is splash proof, and no batteries are needed as you'll just need to make sure your toothbrush is charged. I would just be sure you remember to switch the tips after each use, as I'm not sure how you'll be able to explain that to your roommates. (Although I imagine it's a good way to ensure no one will ever accidentally use your toothbrush, again...ever!)
£9.99 from LoveHoney
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This tingle tip looks very hard and uncomfortable, I bought a soft silicone Brush Bunny which fits over my toothbrush and it works really well.