: What does cavity look like on X ray? Can someone tell me how to spot a cavity on this image? What I have found so far is that it is supposed to be darker area. But I have trouble recognizing it in real x ray image.

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I'm not a specialist but I notice something at the top of the 4th tooth from the top side. Maybe there's the cavity

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Bottom row, second from the front, right at the gum line.

See the darkened wedge-shaped area on the right edge of the tooth in the enlargement below? That is exactly what it looks like: a hole in the enamel of the tooth. That is what a cavity is and it's what it looks like on x-ray.