The mandibles are usually lost, the labrum is reduced to a narrow transverse sclerite, and the labium is a small flap ( though its palps retain quite large).
At the same time, the three sets of salivary glands - the sublingual, below the tongue, the submandibular, below the mandible, and the parotid gland, which is near the ear, all secrete saliva to lubricate the food.