Try jawzercise. You will have chipmunk cheeks after 15 minutes of it. 

@robbie343

have it, but I always get the mold assymetrical and I don't want to fuck myself up long term.
shit is hard af, although if I remember a lot of it goes straight to my temporalis.

I'd prefer hearing if there's anything better to do the natural way.

@fanaticmind

They make “on the go” ones now that don’t require any custom molding (they are pink colored), ready to use right out of the box, but ya it clearly builds your massetter, my face got super boxy afterwards, but clearly worked the massetter. I stopped using it. 

Posted by: @fanaticmind

I used to feel it a lot in the first weeks but now I barely feel it, what's wrong? (btw done it for atleast 3 months consistently, barely any massetter growth)

It's a muscle and it's adapted to the new load, similar to how you work out a muscle in the gym.

Increase the load you place on the masetters. Three ways to do this:

1. Increase the amount of gum.

2. Increase the duration.

3. Increase both.

I wouldn't advise on chewing for hours and hours, though. Could give you TMD if you are not very used to it.

@azrael

Did 4 but i was just as easy, just developed my buxx cuz it was big.
The thing is that it doesn't make sense that the "hardest gum" doesn't do shit for me when people got lots of change from regular gum even

(brett maverick)

Chew it while constantly sipping ice water. Aim for full range of movement without activating the lips or buccinators (OMC). I think people put far too much emphasis on duration of chewing and not enough on the toughness of the gum. When falim gets very cold (idk about mastic) it becomes extremely tough. 20 minutes of working through that will do a hell of lot more for your gains and the health of your temporomandibular joint than several hours of leisurely chewing.