GRAND RAPIDS, Mich. (AP) — A lawsuit against the state's former prison food service contractor says an inmate in Michigan's Upper Peninsula damaged his teeth on rocks in a taco.

The Grand Rapids Press reports (http://bit.ly/1MtVpBM ) the lawsuit says Jeffrey Glen Spates was eating at Chippewa Correctional Facility in May 2014 when he bit three rocks. He says what resulted was months of pain and damage requiring dental surgery.

The lawsuit was filed Monday in U.S. District Court in Grand Rapids. The 48-year-old is asking for $10,000 for cosmetic surgery and $25,000 in damages.

The Associated Press sent an email seeking comment Wednesday from a spokeswoman for Philadelphia-based Aramark Correctional Services.

Another company replaced Aramark as Michigan's prison food contractor last year. Aramark had faced fines for unapproved menu substitutions, worker misconduct and other issues.

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Information from: The Grand Rapids Press, http://www.mlive.com/grand-rapids