Truth Telling Teeth

 are a set of teeth that render their wearer unable to lie.

History
The teeth appear in "Bottomless Pit!" as part of Mabel Pines' story, "Trooth Ache." Mabel grows increasingly sick of and opposed to Grunkle Stan's incessant fibbing, and, upon finding information on the teeth, sees them as a solution to her uncle's problem. After retrieving them from the forest, she swaps the truth teeth for Stan's regular dentures in the middle of the night. Mabel is satisfied with the results, though both she and Dipper Pines come to regret that their uncle is unable to filter the truth, often going on to say things no one wants to hear. After Stan's honesty nearly gets him arrested after admitting to several crimes, Mabel is convinced that truth without a filter is a bad thing, removes the teeth from Stan's mouth, and throws them down the bottomless pit in a locked box. She goes on to say that she never saw the box again, though spots it immediately afterward.

Appearance
The teeth take the shape of dentures and are glowing gold in color.