Some people who use teeth whiteners may experience tooth sensitivity. That happens when the peroxide in the whitener gets through the enamel to the soft layer of dentin and irritates the nerve of your tooth. In most cases the sensitivity is temporary. You can delay treatment, then try again.
Federal prison. A federal prison is operated under the jurisdiction of a federal government as opposed to a state or provincial body. Federal prisons are used for convicts who violated federal law (U.S., Mexico), inmates considered dangerous (Brazil), or those sentenced to longer terms of imprisonment (Canada).
The United States Penitentiary, Tucson is a high-security United States federal prison for male inmates in Arizona. It is part of the Tucson Federal Correctional Complex and is operated by the Federal Bureau of Prisons, a division of the United States Department of Justice. The facility also has a satellite prison camp for minimum-security male offenders. USP Tucson is located within Tucson's city limits, 10 miles southeast of downtown Tucson.