**Core Concept**
The management of periodontal surgical sites involves meticulous oral hygiene to prevent infection and promote healing. Brushing is a crucial component of this regimen, requiring a modified technique to accommodate the surgical area.

**Why the Correct Answer is Right**
In the immediate postoperative period, the periodontal surgical site is susceptible to bleeding and infection. A gentle, soft-bristled toothbrush is used to clean the affected area, starting from the areas farthest from the surgical site and working towards it. This helps prevent the introduction of bacteria and debris into the healing area. The toothbrush is then cleaned and rinsed with sterile water before reapplying any topical agents.

**Why Each Wrong Option is Incorrect**
**Option A:** Brushing the surgical site vigorously with a hard-bristled toothbrush can dislodge the blood clot, leading to bleeding and delayed healing.
**Option B:** Using a sonic toothbrush or an electric toothbrush near the surgical site can be too harsh and may irritate the area, causing discomfort and potentially dislodging the blood clot.
**Option C:** Brushing with a fluoride toothpaste near the surgical site can be too abrasive and may damage the newly formed tissue, leading to further complications.

**Clinical Pearl / High-Yield Fact**
When brushing after periodontal surgery, it is essential to use a gentle, soft-bristled toothbrush and to clean the area starting from the periphery and working towards the surgical site to prevent the introduction of bacteria and debris.

**Correct Answer: C. Gentle, soft-bristled toothbrush.**