Once you use a toothbrush to clean a pencil sharpener, you should no longer use it to clean your teeth.
David Rees (2012). “How to Sharpen Pencils: A Practical & Theoretical Treatise on the Artisanal Craft of Pencil Sharpening for Writers, Artists, Contractors, Flange Turners, Anglesmiths, & Civil Servants”, p.29, Melville House
