1. A suction cup (it should be larger than the concave area of ??the cup lid) and glass glue. First apply glass glue on the suction cup, and then align the suction cup with the concave area. Press tightly and wait until it is completely dry (it may take a day or two to completely dry). Then two people worked in tandem, one pulling the cup lid and the other pulling the suction cup. You can pull out the concave areas.

2. First apply glass glue on the suction cup, and then align the suction cup with the concave area. Press tightly and wait until it is completely dry (it may take a day or two to completely dry). Then two people worked in tandem, one pulling the cup lid and the other pulling the suction cup. You can pull out the concave areas.

3. It usually cannot be repaired unless you contact the manufacturer’s after-sales service for a replacement. If it is a thermos cup, it cannot be restored by heating. Forcibly knocking it will not only deform it, but may also damage the thermos cup.