Oral treatment device

An oral treatment device comprising an intraoral image sensor equipment configured to generate image data representing at least a portion of the oral cavity of a user during use by the user of the oral treatment device. The oral treatment device comprises a controller configured to process the generated image data to determine location data indicating a location of an interproximal gap between adjacent teeth in the oral cavity of the user. The controller is configured to process the generated image data using a trained classification algorithm configured to identify interproximal gaps. The trained classification algorithm having been trained prior to the use of the oral treatment device. The controller is configured to, during the use of the oral treatment device, control the oral treatment device to deliver a treatment to the detected interproximal gap based on the location data.