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Over-extension or under-extension of denture borders leads to loss of retention and to some extent stability of the removable prosthesis which is attributed to mistakes made during the border molding step. To check border extensions of the custom tray before border molding using bubble gum. Bubble gum is softened in warm water and adapted to the borders of the custom tray. The custom tray is inserted into the mouth and the usual functional movements that are done during border molding are done to check any over-extension. This technique is simple, convenient, and bubble gum is easily available.