Tooth Problems

Hi, I have had to have a couple of fillings on the upper left side of my mouth, and as this did not cure the pain I was suffering I was given antibiotics just before christmas for a abcess under another tooth. This removed the pain so that thankfully this year I was able to enjoy my Christmas dinner. After Christmas I had a root filling at great expense, and a little pain. My dentist told ne that he thought he had an 85-90% chance of saving the tooth, so I thought it was worth it. I had radiation to the right side of my neck for tonsil cancer, and I don't have many salivary glands left on the right side so I only eat using the left side of my mouth. My dentist has told me that teeth can be brittle after a root filling and her may want to crown the tooth in six months. Three days after the root filling the back of the tooth has broken off, and I am going to the dentist this afternoon. I am worried that he may not be able to mend the tooth, and may recommend an extraction. However I have heard that extractions can be tricky for people who have had radiation therapy to their jaw, as the jawbone can die in the trauma. Can anybody advice me on this issue.
I'm using the biotene antibacterial toothpaste, but reading the ingredients this doesn't seem to contain fluoride, does anyone know if you can use anything else to apply the fluoride to your teeth
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