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).
Sometimes a defendant's prison sentence is suspended.. A suspended sentence is jail or prison time that is put on hold if the defendant complies with certain other obligations, for example, the conditions of probation or the completion of a drug treatment program. (For more on treatment, see Substance Abuse Treatment for Defendants Facing Drug and Other Charges.)