The whistle toy "Piro Piro Whistle" is also known as "Wipe Back" or "Pichala Whistle". It has been re-recognized for its effects such as diet, rehabilitation, breathing training, and pataca exercises. ◆ Oral function training with "Piro Piro Challenge" The function of the oral cavity is not limited to the “chewing exercise” of chewing food. Perioral tissues also play an important role in keeping food in the mouth and breathing properly. Such functions cannot be trained simply by chewing, and th