A 35-year-old man complains of a sour sensation in his mouth and front teeth sensitivity to thermal and mechanical stimuli. Objective examination revealed visible changes in the enamel of 13, 12, 11, 21, 22, and 23. The enamel is dull, coarse, missing on the cutting edge. Probing of the vestibular surface of these teeth is painful, their response to thermal stimuli is positive. The patient’s medical record states his occupation in industrial production of inorganic acids. What is the most likely diagnosis?