If the four-button buckle is broken, can it be disassembled?

cannot.
When clothes are produced, they are put on with a mold, so if you take them off, the buttons will break.
The four-button buckle cannot be reused. If it is broken, you can only go to a clothing repair shop to get a new button. However, if you want matching buttons for the entire dress, I am afraid they are not available. When buying clothes, the manufacturer usually has a spare one hanging on the tag for later use.
Extended information:
The four-button buckle is made of copper and is divided into four parts ABCD from top to bottom: the AB piece is called the female button, the wide side can be engraved with patterns, there is a hole in the middle, and there are two parallel wires on the side. spring; the CD piece is called a male button, with a dot protruding from the middle. The dot is pressed into the hole of the female button and is clamped by the spring, which generates an opening and closing force to fix the clothes.
Four-button buckles are generally divided into the following categories:
According to the style, four-button buckles are generally divided into: large white buckles, fisheye buttons, blister buttons, plastic four-button buttons, plastic four-button buttons, four-button buttons with diamonds, etc.
According to the surface of snap buttons, four-button buttons are generally divided into: smooth four-button buttons, flowery four-button buttons, diamond four-button buttons, fisheye buttons, etc.
According to the material, snap buttons are generally divided into: metal snap buttons, resin snap buttons (also called plastic snap buttons), plastic snap buttons, etc.
But if there is no special explanation, it is just called a snap button, which generally refers to a metal snap button.