# [Tex/LaTex] Change every first level item in document to bullet

itemizelists

How can I have bullets for every first level item in the document ?

Putting renewcommand{\labelitemi}{$\bullet$} in the itemize works well but just for this itemize. I tried putting it on top of the document but it doesn't not work.

\documentclass{article}
\begin{document}
\renewcommand{\labelitemi}{$\star$}
% instead of star you find more symbols in:
% http://www.ctan.org/tex-archive/info/symbols/comprehensive/

\begin{itemize}
\item Global setting
\end{itemize}

\begin{itemize}
\item is global
\end{itemize}

\begin{itemize}
\item[$\oplus$] this method is more flexible
\item[$\ominus$] but you have to type more
\end{itemize}

\end{document}