Surgery A painless, fluid filled retention cyst appearing in the area of recent dental treatment may be the result of A Failure of absorption of the anaesthetic B Allergic reaction of agents employed C Infection occurred during treatment. D Injury to salivary gland. 💡 Explanation A painless, fluid filled retention cyst appearing in the area of recent dental treatment may be the result of ✓ Correct Answer: D. Injury to salivary gland.