Grows mold because tank does not separate to allow cleaning.
Unlike 3 other battery flossers I purchased for my family this year, this is the only one where the water tank is permanently attached to the pump system.  Water leaks between the tank and pump, allowing lots of mold to grow in the space between them.  This mold can also leak back into the tank when operating the device.  VERY unhealthy!
Rating: 1 stars