Abstract: A new method to measure and study in situ the chemical and mechanical stress of the orthodontic fixtures and to protect them by creating a feedback system for the patient that provides a warning on each exposure to an associated hazard. The device is an individual orthodontic protection cover applied over the arch wire and fixed on the orthodontic fixture by an elastic clamp and set over the tooth with a solid filler material to seal all the inner exposed surface of the tooth. Inside the shell some electronics, powered by a micro-battery, is embedded to measure the pH, temperature, vibration, movement, force on the tooth, etc. using specialized transducers such as piezoelectric and pH transducers attached on the protective cover. The measured value is transmitted outside via radio frequency, or modulated light, or other signal protocol, to a specialized receiver that stores and analyzes it.