"Bon-Bon Sign"

"Bon-Bon Sign"

Involuntary pushing of the tongue against the inside of the cheek, the "bon-bon sign", is said to be typical of the stereotypic orolingual movements of tardive dyskinesia, along with chewing and smacking of the mouth and lips, and rolling of the tongue in the mouth. These signs may help to distinguish tardive dyskinesia from chorea, although periodic protrusion of the tongue (flycatcher, trombone tongue) is common to both.

Cross References

Chorea, Choreoathetosis; Trombone tongue