Inno Sense Large Port Medium Inno Sense Medium Port bits are made of an elastic plastic and are slightly harder than the Inno Sense flexi soft bits. Inno Sense Medium Port bits are slightly flexible and have a tongue port. The plastic of the Inno Sense bits is FDA approved, the material is non-toxic and contains no plasticizers. A straight mouthpiece consists of 1 piece and gives pressure on the tongue, layers and lips. The shape and thickness of the mouthpiece determine where the pressure will be in the mouth. A straight mouthpiece with a tongue port gives more pressure on the layers and keeps the tongue free. The straighter and thicker the mouthpiece, the more pressure on the tongue.