What adaptations would an alien have to chew food in a humanoid manner without a tongue?

On Earth, most animals have tongues, albeit in many forms. This is due to the evolution from a common ancestor. Tongues are not necessary for communication, be it auditory or otherwise. However, they are essential for eating in a humanoid fashion, they keep food between the teeth during the process of chewing.

Let's assume that they kept chewing in a humanoid manner, with a similar mouth composition, despite its disadvantages. Would increased acidity of saliva suffice? If not, what adaptations (not including a tongue) could have evolved?

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What adaptations would an alien have to chew food in a humanoid manner without a tongue?

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