We call this an incipient lesion, meaning it’s about to turn into a real lesion. These are the kinds of early cavities that fluoride is good at “healing”. To make this work, you need to commit to being great with brushing, flossing and with fluoride use. We also require monitoring of these lesions. If that decay progresses and we don’t see it, it can get very big, very quickly. This generally means we would need to take these x-rays more often for a while, to be sure the early cavity isn’t growing
However, when we do all of these things, we have helped many patients keep teeth like this unrestored for years. Which makes everyone happy.