Why Kanka (Benzocaine) Should Not Be Used on Gums After Wisdom Tooth Extraction

Kanka is a topical benzocaine product intended for temporary relief of minor oral pain (e.g., canker sores). It is not for use on open surgical wounds or extraction sites. Applying it to healing gum tissue can cause irritation, delay healing, and poses a risk of methemoglobinemia (a rare but serious blood disorder) if absorbed systemically—especially in children.

Follow your dentist's or oral surgeon's post-op instructions: typically saltwater rinses, prescribed analgesics, and avoiding topical anesthetics on the surgical site.