Big Mouth / Tooth Mug

It's counted that a tooth mug used for 3 weeks contains bacteria 80 times as much as that in the water of nightstool.
A tooth mug used for several days has a thick layer of dirt on the bottom,which can't be washed away easily.Thus it won't help to clean the mouth but transmit dieses.
“Big Mouth” is a cup made of methyl vinyl silicone rubber with smooth surface,which is not so flexible and to make it return to its original state requires external force.Thus we can turned the mug from inside out to clean the bottom and side of it conveniently.Then we can make efforts to keep the oral capacity healthy and prevent diseases coming through mouth.