Omnident gel is antiseptic,anti plaque toothpaste which is mainly useful for healthy gums and also helps in preventing caries as it has Fluoride in it. However it cannot cure existing cavity .
Next Steps
Visit dentist and get treatment done for cavity. For gum pain if pain persist even after using omnident gel get scaling done and then use this gel...this will reduce gum pain effectively.
Health Tips
Don't ignore small cavity or gum pain. Visit dentist as early as possible.