Buffalo- During the 1st year, students spend one afternoon at the clinic.
During the second year:
"In the fall semester of the second year, students spend one afternoon each week treating periodontal recall patients (patients who have completed periodontal therapy at the school and return for periodic evaluation). With the guidance of faculty, students review patients' medical histories, perform oral examinations, evaluate their periodontal status, and provide oral prophylaxis and home-care instructions. Second-year students also assist third- and fourth-year students, which allows second-year students to become familiar with the operation of the clinics and to observe the practical application of principles presented in their preclinical courses.
In the spring semester, students are assigned to one of four practice groups for the remainder of their clinical training. Students spend three half-days each week in the clinic and are assigned between four and eight patients with selective needs to begin the clinical experience in restorative dentistry. Under the guidance of faculty, students learn the basics of diagnosis, treatment planning, and local anesthesia as they prepare and restore teeth with amalgam, composite resin, and cast restorations and provide periodontal therapy."
Straight from UB SDM website.