Disclosed herein is an electric toothbrush with a toothpaste cartridge. The electric toothbrush may include a main body with a top end adapted to engage with a removable brush attachment. The main body may be configured to accommodate the toothpaste cartridge, one or more conduits, a servo mechanism, a controller, and an energy storage device. The removable brush attachment having an elongated structure configured to be removably attached to the main body. The elongated structure may include a first end including a brush head with a front surface. The front surface may include one or more openings configured to dispense a fluid flowing through a passage within the removable brush attachment. The toothpaste cartridge having a flexible cylindrical tank configured for storing the fluid, and to release the fluid into the one or more conduits when a pressure may be applied to the toothpaste cartridge by the servo mechanism.
