Tooth-size/arch-size discrepancy refers to a condition in orthodontics where there is a mismatch between the size of the teeth and the available space within the dental arch. This condition can lead to various clinical manifestations such as crowding, spacing, or misalignment of the teeth, which in turn may affect both the aesthetics and function of the dentition. The condition is often evaluated through measurements of tooth size and arch dimensions, with tools such as the Bolton analysis used to assess the discrepancy between the sizes of the upper and lower teeth and radiographs like cephalometric analysis.