Helol
I use soft cotton masks which have ties that go behind my neck and the other loops behind my ears. The cotton does not rub on your skin as much as the paper alternatives, and is not so tight as the one which are used in chemical or dusty environment's. We use the latter at work, but in the environment's mentioned, but I would not consider wearing one for multiple hours on long haul flights. You are obviously allowed to remove them when eating and drinking, and I would suggest you chew very slowly and drink even slower or more often
Cheers
Mr Mac