A 20-year-old patient complains about unaesthetic look of the 24 tooth from the moment of its eruption. Objectively: enamel of the 24 tooth is partly absent, the dentine is yellow. The 64 tooth was treated more than once when she was a child, but because of frequent exacerbations, edemas and gingival fistula the 64 tooth was extracted when she was 9 years old. What is the most likely diagnosis?