Cavitas Sensors: Contact Lens Type Sensors & Mouthguard Sensors

“Cavitas sensors” attached to body cavities such as the contact lens and mouthguard (“no implantable”, “no wearable”) are attracted attention as self‐detachable devices for daily medicine. Many types of contact lens (CL) sensors using electrical and optical methods have been developed for monitoring not only chemicals (glucose, lactate) and electrical conductivity in tear fluid, but also transcutaneous gases at eyelid mucosa. A CL intraocular pressure telemetric sensor has been also commercialized and applied to patients for monitoring the intraocular pressure. Some mouthguard sensors have been investigated for a real‐time measurement of salivary chemicals. A graphene based sensor on tooth enamel was reported to be capable of salivary bacterium detection. Here we review the challenges regarding the integration of biosensors into monitoring for biological information of body cavities. The self‐detachable cavitas sensors are expected to improve the quality of life in the near future.