Parentheses ( ( ) ) can be used to insert explanatory or qualifying material that you want to de-emphasize, or information that doesn't fit naturally into the flow of your text. Because they are so jarring to the reader, parentheses should be avoided whenever possible.
If removing a parenthetical note changes the meaning of the sentence, it should not be in parentheses.
Place a period outside a closing parenthesis if the material inside is not a sentence (such as this fragment).
(Place a period before the closing parenthesis if the material inside is a complete sentence.)