(This phrase acts like a noun. It is the direct object of the verb stopped. This phrase is a gerund phrase.) I stopped believing in Santa Claus when my mother took me to see him in a department store, and he asked for my autograph. (This phrase acts like a noun. It is the subject of the adverbial clause when my mother took me to see him in a department store.) I stopped believing in Santa Claus when my mother took me to see him in a department store, and he asked for my autograph.  It is the object of the preposition for.)
Ive googled 'white in extraction site'(!) and had some conflicting info: 'The white material is the blood clot; your rinsing has merely washed away the red blood cells and left the clotted fibrin material, which is white. This is normal, and is of no concern'. The second: 'White color in the extraction cavity...
Healing after Extractions and Oral Surgery. After one or more teeth have been removed, you will want to do all the right things for the area to heal quickly and smoothly. This requires that a blood clot is formed. The blood clot covers the extraction site and allows the area to heal. A lot of the tips below help the blood clot to form properly and not become dislodged. It is normal for the area to be tender for the first few days, and in most cases simple over-the-counter pain relief is enough to ease any discomfort.