If it's a famous pot, take it back to his shop. He will help repair it if it is generally small. But there may be a charge. If it is minor, it can usually be repaired. But it's not mending, it's polishing. You can still see a little, but it's hard to find it without looking carefully.

If it is an ordinary pot, if it is raised in general, don't use it, just raise it. If the gap is small, the same color will be less conspicuous after a long time.

If it's an ordinary pot, but it's well preserved, I suggest two. One is to use toothpaste first, the most common kind (remember not to use the brand, because the brand's polishing ability is poor), touch a little toothpaste with a cotton swab, and carefully grind a big circle on the edge, but the area is as small as possible, only on the raised edge. Touch it until you feel it won't scratch your hand. Then use a cotton swab to scrub the place where toothpaste has just been applied with hot water. Remember not to use the whole pot, just wipe the toothpaste. Otherwise, the patina will be washed away. After cleaning, enter the second part, and apply hot tea (must be hot) with a pot pen to the place just cleaned with toothpaste. After repeated application for a few days, about 4.5 pots of tea, it is basically the same as the color next to it. So you can continue to use it! If you don't mind that the color of the spout is a little uncoordinated in the first few days, you can use it directly to make tea, but this may lead to different patina in the end.

There are probably only a few ways to repair the teapot. See what suits you better! These are all my experiences. I hope I can help you. If you find any better way, please let me know. Thank you!

Hope to adopt.