What would happen if no sufficient anchorage is provided during tooth movement?

When insufficient anchorage is provided during tooth movement, the passive unit, or the teeth that are not intended to move, may instead move. This occurs because the anchorage is meant to stabilize a segment of the dental arch while allowing specific teeth to be moved. If the anchorage is inadequate, the forces applied may not be effectively managed, resulting in unintended movement of the passive unit. This can lead to undesirable outcomes in the treatment, as the teeth that are supposed to remain stationary can drift due to the lack of resistance against the applied forces. Therefore, effective anchorage is critical in orthodontic treatment to ensure that the desired teeth move in the intended direction while keeping others stable.