Labial consonants are consonants in which one or both lips are the active articulator. They generally preclude linguolabials, in which the tip of the tongue contacts the posterior side of the upper lip, making them coronals, but sometimes, they behave as labial consonants. The two common labial articulations are bilabials, articulated using both lips, and labiodentals, articulated with the lower lip against the upper teeth, both of which are present in English. The other labial articulation is dentolabials, articulated with the upper lip against the lower teeth (the reverse of labiodental), normally only found in pathological speech.