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If the screw of the glasses is dropped, you can use a toothpick to clamp the connection between the glasses leg and the glasses frame, so that the glasses can be used normally. At the same time, if the screw of the glasses falls off, you can go to the glasses store to match a screw. Generally, the glasses store will not charge and can provide help free of charge.
Usually, it is OK to find and install the screw after it is lost. If it is lost and cannot be found, it is necessary to find another screw to replace it. However, the screws of glasses are very small, and it is generally difficult to find replacement. So if you are at home, you can use a toothpick to replace it. Break the toothpick into the size of a screw, and then put it in the position of the screw. Because the thickness of the toothpick is very consistent with the screw, using the toothpick can quickly solve the problem that the screw of the glasses falls off, and the operation is relatively simple.
Generally, it is OK to replace screws with toothpicks, but they should be clamped tightly, otherwise the toothpicks will fall off over a long time. It is best to go to the glasses store to replace new screws in time, so that you can use them more safely. General optical shops will provide services free of charge in order to win trust and repeat customers.