The protocol is good but requires modifications.

العنوان العربى: كتابة ليزر بدلا من ليز

Is there a difference between "comparison" and "direct comparison"? In other words, can "direct" be removed from the title?

2- Principal Investigator details (department and institute not listed)
3- Research funding details were not specified; "self-funding" was stated instead.

4- The scientific background is very brief and phrased as an objective rather than a review of studies relevant to the protocol.
5- In the practical section, the specific type of tooth—whether anterior or posterior—was not specified (does the effect vary depending on the tooth type?).

6- Sample size calculation: The reference used for this calculation was not cited.
7- As the study involves teeth *in vitro*, the principal investigator is requesting a waiver of informed consent; however, the researcher did not address questions related to this waiver, such as: the type of waiver requested, an explanation of why conducting the research is not practically feasible without the waiver or an approved modification, and the reasons for requesting the waiver.