Possible Clues:

• One might give it a mouth wash, but never a mouth watch
• Bush harbours condition that's half Arab offered
• Forget his remarkable equine present!
• Chance benefit (oral exam not recommended!)
• ''Never look a . . . . . . . . . in the mouth''
• Look, just for the present, avoid the mouth
• Forget his free offer — dental examination not recommended
• The Trojans' undoing?
• Hack, perhaps, given change to forge this
• Beast with a mouth best left unexamined