CHAIN ​​is an application that develops therapeutic patient education as part of the maxillofacial physiotherapy treatment of bruxism (grinding or clenching one's teeth). It includes a first part linked to information relating to bruxism (causes, effects, prevention) and a second part relating to the description and monitoring of the performance of personalized rehabilitation exercises to be done at home and prescribed by the maxillofacial physiotherapist of the Liège University Hospital.