I'm 20 years old but my jaw still looks quite undeveloped and this bothers me a fair bit.

I am a late developer and it's possible my jaw might not finish growing untill i'm in my mid 20's.

I've often wondered if theyre's any way too exercise the jaw to help strengthen it and create better definition. Like maybe chewing gum, opening and shutting the jaw, resistance exercises n stuff.

I've searched the internet top to bottom and cldnt find any info on this topic. If anyone cld help me out that'd be greatly appreciated.