Cavity or what??

This tooth the pit hurts! Just this tooth. And whenever I drink hot or cold it hurts a lot like really sensitive. My dentist told me I have no cavities and everything looks fine. Buuuut I kept feeling like something isn't right! So I took this picture with flash on bc I couldn't see in my mouth that well. And surprise surprise it looks like this? 😩 seriously?! It's not like I don't brush my teeth!! Why didn't my dentist say anything??

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