Showerhead devices incorporate sensors to control bath fill levels. Showerheads have interchangeable attachments, including bristle attachments. Oral care devices are attachable to standard shower arms. Pump devices allow various lotions and fluids to be used in conjunction with showers. Shower organizing devices provide for ordered storage and access to accessories. Bathtub spouts including sensors and valves to control bathtub filled levels.

A water-level measuring device using a gear ratio includes: a water tank filled with water; a float receiving buoyancy by being floated over a water surface of the water filled in the water tank; a cable connected to the float and extending to the outside of the water tank; a first gear connected with the cable; a second gear connected with the first gear; a weight pendulum connected with the second gear and moving in up and down directions, wherein when a water level of the water tank descends, the weight pendulum ascends due to a weight of the float, and when the water level of the water tank ascends, the weight pendulum descends due to the buoyancy of the float.

A water-level measuring device using a gear ratio includes: a water tank filled with water; a float receiving buoyancy by being floated over a water surface of the water filled in the water tank; a cable connected to the float and extending to the outside of the water tank; a first gear connected with the cable; a second gear connected with the first gear; a weight pendulum connected with the second gear and moving in up and down directions, wherein when a water level of the water tank descends, the weight pendulum ascends due to a weight of the float, and when the water level of the water tank ascends, the weight pendulum descends due to the buoyancy of the float.