Unfortunately, we are not in the position to determine whether the donabe is still okay to use or not, because we cannot know the actual degree of the damage caused by the impact. We ask you to use your own judgement and responsibility (and common sense). If you are not sure, you shouldn’t use it. Even if the damage looks to be just a tiny chipped part, there might be invisible tiny crack(s) inside and which might cause unexpected breaking of the donabe during cooking. That being said, if the damage is solely a small chipped part(s), and if it won’t affect the usage, it’s normally okay to use. My Kamado-san donabe has many chipped parts here and there after cooking almost every day past 10+ years, and I consider them part of my donabe’s “characters”.With regard to repairing a broken part of donabe, because it’s a cookware and can be used at a very high temperature, we would not suggest a regular super glue. We suggest you consult with a professional repairman with knowledge of repairing pottery cookware. Please also note that depending on the size/ type of damage, the repaired part can be more fragile and cause further damage.