- Better start the title with "assessment of knowledge and attitude...." 

- Better to include the place of research “Cairo” in the title.

- As you will use the dentists of Cairo in your research, you cannot use the Egyptian dental syndicate website 39960 Egyptian dentist. This “39960” is from all governorates. This means that sample size of 381 is not correct. Please, recalculate the sample size using the number of Dentists in Cairo governorate only (or Greater Cairo). Re-write the recalculated sample size in flow chart and procedure.

- There is no need to mention the calculated sample size at 90% confidence interval that will not be used.

- The informed consent form is not uploaded