Lettering, numbers, pictures that are part of a cookie or cake itself. (It's all one dough).
Making a Bruise or Using a Toothbrush When One's Gums Might Bleed. Using Floss, Toothpicks, and Dealing with Blood from a Cut;
ודבר דבר (Dabair Davar): Understanding the Reasons Behind Talking About a Mitzvah on Shabbos;
(Squeezing materials.) using other types of brushes: steel wool, brooms, rubber scraper, etc.;