Do parasites have teeth

There are three main classes of leeches: GnatbobDELLida, or jawed leeches, use teeth to bite the host, and secrete hirudin, which prevents the blood from clotting. RhyncobDELLida, or jawless leeches, insert a needle-like protrusion called a proboscis into the host. They also secrete an enzyme called hemetin, which dissolves blood clots. PharyngobDELLida have no jaws or teeth, instead swallowing their prey whole. They feed mainly on small invertebrates.