ROCKJAWTuff Gum | Tough Jaw Training Gum | with 20mg Caffeine | 20mg Taurine | B Vitamins | Aspartame Free, Sugar-Free | Xylitol | Plastic-Free Gum (2 Month Supply)

Definitely hard to chew, flavour doesn't last long. Good for a wee boost of caffeine

Is it a hard to chew gum? Yes it is, specially in the beginning. I've been "chewing" the product for almost 2 weeks, so it's too soon to talk about results, but it is hard to chew indeed.Sadly, the flavor goes too soon, just a few minutes after I start chewing, so that could be improved.Overall, the product is as described, and it arrived on time.I will buy more.

A bit sweet and stopped working after a while because it went soft

Great stuff. It's changed the shape of my face after three months of using it.

It does give my jaw a little workout. Lasts about 30 minutes before it becomes too soft. Two stars because the price for what you get is silly. Would not buy again.

so.. start slowly, and then chew as you like, you'll be chomping through iron bars like Jaws in 007 in no time

on the photos it states that it is Aspartame free, great, hence bought it. BUT they put sorbitol into it as the back of the packaging says. Its a bit like saying: free of thrones from roses, but it contains bramble instead! Sorbitol is a sweetener and has similar side-effects as aspartame and might even cause DNA damage and cancer.

The flavour does last long but it tastes very nice. The gum is a perfect hardness