Darkening in the middle of the tooth can be due to calculus, or tooth decay and nerve necrosis. Darkening of the middle of the tooth can occur if there is a buildup of calculus, along with pigmentation. This cannot be removed by daily brushing and requires an ultrasonic cleaning to remove the tartar and pigmentation and restore the original color of the teeth. Caries is an infectious disease that occurs when bacteria infect the hard tissues of the teeth, and the change in color that occurs before the enamel disintegrates is manifested as a darkening of the teeth. If caries is not treated in time, bacteria further infect the dental nerve, resulting in pus necrosis of the nerve, the hard tissue of the tooth body loses the nourishment of the nerve, the tooth will also appear black or gray changes. The specific cause of blackening in the middle of the tooth can be examined by a dentist.
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