P.O. Box 9739 Naperville, IL 60567-9739
Ph: 630-355-7912 or 800-942-IDLA
Ivoclar-Williams Kennedy Hawxhurst, CDT
343 Scott Street Lake Forest IL 60045 Voice: 847-234-2022 Fax: 716-691-2285 Toll Free: 800-533-6825