Clenching has bigger effect than mewing.

[Deleted member 19101]

Like clenching back teeth makes me mew automatically and also trains massetter muscles

 

[vaseqmoherad]

And gives you tmj and gum disease.

 

[Deleted member 19101]

And gives you tmj and gum disease.

 

[Deleted member 27729]

And gives you tmj and gum disease.

If done excessively , otherwise no