An extensive brushing teeth/mouth/tongue regime in the morning was my routine before leaving to go to work, then on the drive to work, a couple pieces of chewing gum, then I would change my gum for fresh pieces for the walk from the carpark to work.
I have no idea though whether it did the job or not, but no one in 4yrs ever said anything, about smelling alcohol, or appearing slightly still tipsy I would say in the mornings after heavier nights.
On a night out though, I 'd say it came across quite obvious as the hours went on, when your turned away for being too drunk by bouncers, it must be pretty obvious!!