How I Met Your Mother: All the plot holes, mistakes, and unanswered questions

[post_page_title]The single toothbrush is a lie[/post_page_title]

In season 5, episode 14, Lily and Marshall both tell everyone that they share one single toothbrush. Of course, the couple also lives with Ted, who claims that this is also the toothbrush he uses. Then, Robin chimes in, explaining she used it too when she was dating Ted.

The single toothbrush is a lie

Everyone’s grossed out, but they ultimately move on. However, all the way back in season 1, episode 14, Lily and Marshall are clearly seen brushing their teeth at the same time.

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