**Author details**

Kasusu Nyamuryekung'e and Febronia Kahabuka\* School of Dentistry, Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania

\*Address all correspondence to: febby.kahabuka@gmail.com

© 2021 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
