-“Stick out your tongue.”
When it comes out, is it symmetric, coming out straight?”
-“Move it to the side, left and right.”
Do they move equally side-to-side? That’s all you really need to do, although some people also like to test the strength in the mouth.
-“Put your tongue here in your cheek. Don’t let me push. Good. The other way. Excellent.”
Normal tongue strength.