Tongue Exercise Multiflavour (50 Spots)

Bought these for my 4 year old but they dont stay in the roof of his mouth. He's not trying to push them away either, just gently licking them as instructed.

Have started with this for the boy who has trouble with speaking. It's hard when he is at school and he doesn't take it to school with him so we have been giving him at home after school for his reading and when he goes to sleep