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 Federal Bureau of Prisons classifies prisons into several categories: United States Penitentiaries Federal correctional institutions Private correctional institutions Federal prison camps Administrative facilities Federal correctional complexes This list does not include military prisons, state prisons, jails, or prisons operated under contract with local governments. It also does not include detention centers and facilities and processing centers run by Immigration and Customs Enforcement.