Sonic toothbrush

In one alternate universe, the Tenth Doctor used a sonic toothbrush instead of a sonic screwdriver. When the prime Tenth Doctor's universe was affected by the Continuity Cap, the two devices briefly swapped places, much to the chagrin of the "prime" Doctor, who needed his screwdriver. (COMIC: The Continuity Cap ^[+]Loading...["The Continuity Cap (comic story)"])