\addtolength is causing registered symbol to go beyond the margin

Question

I am having a little but painful problem that is the registered trademark symbol in my thesis is going beyond the right margin (see the figure). I have noticed that if I do not use \addtolength command then the problem is solved. However, I am searching a solution using which the problem could be solved without removing the \addtolength.

\documentclass[12pt]{book}
\hoffset-7mm
\usepackage{amsmath,amsfonts,amssymb, amsthm}


%======================================================
\addtolength{\textwidth}{18mm}
\addtolength{\textheight}{10mm}
\addtolength{\topmargin}{-10mm}

\begin{document}


\begin{itemize}
    \item The \textbf{Preprocessing time} means the average time taken, in seconds, by MATLAB{$^{\mbox{\small\textregistered}}$} to generate the constraint matrix and other parameters required to solve the model by the CPLEX{$^{\mbox{\small\textregistered}}$} solver. 
\end{itemize}

\end{document}

Unrelated, but instead of MATLAB{$^{\mbox{\small\textregistered}}$} you probably want MATLAB\textsuperscript{\textregistered}. — campa, Oct 08 '19 at 15:30
@campa it is true that same thing can be done as you suggested but the problem of crossing of margins still persists. — Optimist Optimizer, Oct 08 '19 at 15:42
LaTeX estimated that crossing borders for small amount is less disturbing than push whole word in new line. — Zarko, Oct 08 '19 at 16:07
The first line of the paragraph is set as tight as possible, and the line is just too long. It has nothing to do with the "registered" sign. @Zarko's explanation is correct. If you really want to reset the paragraph so that "MATLAB" goes on the next line, you can use the sloppypar environment: How to avoid using \sloppy document-wide to fix overfull \hbox problems? — barbara beeton, Oct 08 '19 at 16:22
@barbarabeeton thanks for your suggestion the sloppypar environment really solved my problem. — Optimist Optimizer, Oct 10 '19 at 10:34

\addtolength is causing registered symbol to go beyond the margin

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