Re: Pain while flossing - cavities at gumline?
My dentist told me to use Colgate for sensitive teeth as they, above the others, have found the correct PH for sensitive teeth. It has seemed to help me quite a bit. He also said that Colgate will work much faster while Sensodyne can take up to a month to feel a difference.
It sounds like you are obsessing over your teeth. I don't mean that as a criticism for I have done the same thing many times and have always had teeth problems. Even though it is difficult, try to trust and believe your dentist. Yes, most cavities do show on an x-ray and it sounds as if he has done a pretty thorough check of your mouth. You are always entitled to a second opinon, so if you are not comfortable then go and get one. Sometimes feeling better emotionally can help to feel better physcially. Some of us need more reassurance and that is perfectly OK. The other thing to remember is that it is your mouth. You know where it hurts and what that feels like, so don't be afraid to speak up about it. Dentists often look at me like -what???? But, on the other hand, often I have been right - it was a nerve or an infection. So, while trying not to stress too much, also be aware of how your mouth feels. Anything serious will usually be intense pain, minor things will cause minor discomfort.
Hope this helps.