A fresh haircut and a shave will help and no chewing gum or cigarettes.

最好能剪个清爽的头型、剃干净胡子，不要嚼口香糖、不要抽烟。

youdao

Football's fear and loathing would like us to believe they have "no class", that they are the kind of lottery winner who would be chewing gum as they swigged from a beaker of warm champagne.

足球带来的恐惧和憎恨希望我们相信他们的足球“没有品味”，他们就像是那些一边嚼着口香糖一边从大口杯中狂饮香槟的彩票中奖者。

youdao

The findings in this case were that both alertness and intellectual performance were increased in gum-chewing subjects, while memory showed no significant improvements.

FORBES: Chew Yourself a Better Brain