This "Articulation Mouth" is used for teaching placement for the T sound. Make sure to teach that the T is silent and short (compared to the S).
Print them out and have them on hand.
These mouths have been very useful for students who are trying to articulate these sounds. I make sure to consistently give each new speech articulation therapy student one of these sheets, so that they learn from the beginning that our mouth, tongue, teeth and air look and move differently for each sound.
I hung all of these "Articulation Mouths" coloring pages up on the wall near our therapy table, so students can easily and readily compare mouth placements for the sound they are learning. I've even "caught" many students looking up at the "Mouths," while waiting for their turn in group therapy, studying and mouthing all of the sounds on their own. :)
I make sure they understand the difference between the two, focusing on the teeth, lips, tongue and airflow.
Then, I hand out the coloring page and ask them to carefully color all the parts: lips, tongue, teeth and air.
You can have them repeat the sound as they color, if they can produce it at the isolation level.
In a group session, I have the kids color in between turns.
Once the image is colored, I save it for further sessions so that I can point to specific parts on their drawing to remind them which part of their mouth needs to be adjusted.
After they can produce the sound, they can take their "Mouth" home and hang it up to remind them to practice at home, allowing for generalization.
Full page, easy to see and color.