Hello,
Based on your description, it appears that the area may have become irritated after scaling, resulting in a small ulcer or minor soft tissue injury. This can occasionally happen, especially around teeth that have undergone Root Canal Treatment (RCT) or where significant deposits were removed.
The pain, redness, and white patch you are noticing are often associated with a healing ulcer. Continue maintaining good oral hygiene and avoid spicy, hot, or hard foods for a few days. You may rinse gently with warm salt water 3â4 times daily. If prescribed by your dentist, continue using the mouthwash as directed.
However, since the pain is persisting and causing discomfort even while drinking water, I would recommend a clinical examination to rule out any localized infection, traumatic ulcer, or gum inflammation around the treated tooth.
Most such lesions heal within 7â10 days. If the pain increases, swelling develops, or the ulcer does not improve, please visit a dentist for evaluation.
Next Steps
If ulcer persists for more than 2 weeks, visit to the dentist.