An oral negative-pressure therapy system (10) includes a container (14) and absorbent insert (70) for the container (14). The container (14) includes a baffle (50) inside an interior of the container (14). A fluid passageway (60) extends along the baffle (50) for delivering fluid (e.g., a mixture of air and saliva) into the container (14). The absorbent insert (70) for absorbing liquid (e.g., saliva) in the container (14) may is over the baffle (50). At least one of the baffle (50) and the absorbent insert (70) is configured to maintain a fluid flow path between the baffle (50) and the absorbent insert (70) to maintain fluid communication between a fluid inlet (44) and a fluid outlet (46) of the container (14). The absorbent insert (70) and/or the container (14) may be designed and constructed to burst air bubbles in the aspirated liquid. The absorbent insert (70) is replaceable so that a spent absorbent insert can be replaced with a new, fresh absorbent insert.
