The dentist-patient relationship in removable partial denture construction is enhanced by careful attention to mouth preparation before the final impression is made. The patient's health has an effect, favorable or unfavorable, on the longevity of the prosthesis. Mouth preparation for the removable partial denture impression is directed toward the reduction of stress in order to protect and preserve the teeth and tissues. The preconstruction planning should not only include improvement of the existing conditions, but should prevent the inclusion of new stresses.