I wouldn't bother, honestly. I'd put him back in his enclosure and leave him alone for a few days. You can listen for an RI and look at the outside of his mouth in the meantime. All you really have to do is lift his lip with your finger, if there's bubbles/lots of saliva you'll see it. He needs to be left alone for the time being, not have his mouth pulled open every day.
Sent from my LG-H812 using Tapatalk