Why Is There a Hole In The Cushion Of My Brush?
This air cushion is to provide ventilation and to aid in drainage after the brush has been washed, air can circulate underneath and dry out the rubber Additionally it helps to prevent any bacterial growth that could occur with pooling water on the inside of the brush. If there was not a hole, the cushion would trap the moisture, and eventually ruin the brush. Meanwhile the hole keeps air pressure balanced by air hole. Bring added elasticity and comfortable massage enjoyment.