Yes, sneeze with your mouth open!

I generally tell patients to avoid straining or nose blowing for six (6) weeks after rhinoplasty. Regarding sneezing, (1) it's hard to avoid, and (2) it's very hard to do this suggestion consciously-and it's not very friendly in terms of minimizing risk of spreading viral illnesses (including COVID!)-but it is better to sneeze with an open mouth to reduce any potential pressure to your head and neck area, which can be painful with a vigorous cough or sneeze. Especially if bones were rebroken during the rhinoplasty, they are delicate and need time to heal properly by sitting still, and avoiding exertion or pressure to the head helps with that process.

Yes you may
Dr G

Sure. And work on sneezing through your mouth will reduce discomfort at anytime until you feel back to yourself.