How do I calculate totals of certain words used in a workbook?

https://docs.google.com/spreadsheets/d/1U2Sm6DyqIB93As7282xEWDBG_Rre6IFhCKl6th-krb0/edit?usp=drivesdk

I'm trying to find out what products are the most commonly used on r/skincareaddiction. So I want the sheet Totals to count how many times a word was used in the workbook, BUT I only want it to count it once per sheet. So if a sheet says "Origins GinZing Eye Cream" twice in a single sheet I want it count it as once, since that's the same person saying they use it twice in one day.