Gnawed Nails

I feel annoying every time when he bit his nails. This is my ex-department head bad habit.

I don't know if there any one told him he should not continue this bad habit. He is no more a young kid, some more he likes to do that during meeting. Which it looks so obvious that he is totally no interest with the topic that the chairman talks.

Come across this article about nail health: -

Biting your nails may be nothing more than an old habit, but in some cases it is a sign of persistent anxiety that could benefit from treatment. Nail biting or picking has also been linked to obsessive-compulsive disorder. If you can't stop, it is worth discussing with your doctor.

Forward this message to him via email. Perhaps he is alert with his bad habit and willing to chance.