Study carried out in collaboration between the Corporación Miastenia Gravis de Chile and the Universidad del Desarrollo. Complete periodontograms were performed on 9 patients belonging to the corporation, in the cities of Santiago and Concepción. In addition, an interview validated by experts was carried out to evaluate the perception (through structural semantic analysis) that they have developed on whether or not their oral health has worsened since the time of diagnosis of their disease.