The Dentist will see you now

Just back from having a filling. The dentist had to get the dental nurse to place a finger on my chin - seems I was showing signs of wanting to 'chew the drill', not, as she helpfully pointed out 'a very good idea'. It must be novocaine that unleashes a reckless streak in and around my jaws. Her predecessor told me off for trying to bite her just after the jab took effect.