Autism Speech Therapy Oral Muscle TrainerAutism Speech Therapy Oral Muscle Trainer Tongue training device Kids Specification: Material: pp+304 metal How To Use: You can choose according to your situation 1. Up and down exercise training Open your mouth, put the tongue movement vertically in the middle of the mouth, and then push the ball upward from the bottom The tip of the tongue recovers from top to bottom. Repeated training 50 100 times; 2. Left and right exercise training Open your