###Human: How can large tooth cavity be treated? ###Assistant: Hello. As a human we all carry some kinds of secrets or fear back in our head. I felt glad as you have the courage to admit that, most people cannot. So be proud of that. I think you need a scaling too, as you have not brushed for a long time its leads to swollen gingiva that might be the reason of uncomfortable using a brush. As you have caries and sensitivity associated, you might not necessarily need an extraction. If the caries has progressed alot, root canal can be done to save your tooth. Betadine Mouthwash, Gargle in lukewarm water 2-3 times a day. Do not worry, use it, if any foul breath that will be covered and your secret will be safe. As you feel uncomfortable using a brush, you can brush using your finger and toothpaste. That way your mouth will also be clean and issue with bristle will also be resolved. You can also take capsule Sporidex 500 mg one apsule BD for 5 days, tablet Zerodol SP 1 tablet BD for 5 days, capsule Pan D one capsule BD before meal for 5 days. You will be needing a scaling to remove any tartar. Once done you can start practising brushing using a soft bristle brush (even a baby brush will do for a start). I am confident you will succeed. But you have to start the habit and you will get used to it, trust me. You can train and motivate yourself by rewarding a candy or anything special. By that way you can overcome your fear and gain comfidence. I am glad that I could be someone whom you can share a secret. I wish you good luck. You can trust me and ask if any further query. I will be happy to help further. Hope your treatment goes fine. Do as I asked you to do. You are brave, you will be fine. I am confident about that.