Abstract: Measurement devices include a housing featuring a channel, where the housing is dimensioned to be worn in an oral cavity of a user and the channel is positioned such that at least some of the user's teeth are positioned in the channel when the housing is worn, a first sensor positioned within or on a surface of the housing, where the first sensor is configured to generate a first measurement signal that includes information about a position of the measurement device, and a second sensor positioned within or on a surface of the housing, where the second sensor is configured to generate a second measurement signal that includes information about at least one of a biochemical and an electrical property of the user's oral cavity.