Spread his mouth wide open.
The dental cheek retractor opens him up to whatever you want to put in his face. It doesn't hold his jaws open, but we've got other gear that does that.
Cheek Retractor Dental Mouth Gag Specs and Benefits:
Size: 4.5 inches outer width, 3.35 inside width, 3.5 inches in length
Comfort cradles slides to push the cheeks outward
This keeps your partner's mouth nice and open