Dr. Roger H. Kallal, Dr. Robert D. Schwartz, Dr. Richard J. Balcerak, Dr. Jeffrey K. Collins, and Dr. Tyran E. Johnson comprise Oral & Maxillofacial Surgery Associates, PC. The doctors' office is located on East First Street in Hinsdale, and treat patients with issues such as impacted wisdom teeth, TMJ disorders and other surgical needs. All dentists are Board Certified and see patients Monday through Saturday by appointment only. Please feel free to visit the web site or contact the office for more information. The dentists have several other locations in the greater Chicago area.