The lips also play an important role in the matter of articulation. They can be pressed together or brought into contact with the teeth. The consonant sounds which are articulated by touching two lips each other are called bilabial sounds. For example, /p/ and /b/ are bilabial sounds in English. Whereas, the sounds which are produced with lip to teeth contact are called labiodental sounds. In English there are two labiodental sounds: /f/ and /v/.