Help! Toothache or Sinuses or Root Canal or What?

I have an upper right molar that has an old filling in it. After a bowl of cereal yesterday it started aching and has since ached but this is a very dull ache with an occasional slight increase. It's weird. Because I have had 5 root canals in my past, I know about the tests to determine root canal. However, these don't always work. My last apmt in Jan, DDS said all is well, no more RC's just fillings. Anyway, as of yesterday I don't know if that's true. So I performed the tests: Ice:nothing, Heat:nothing, Tap:nothing. I have a mirror tool so I looked at the tooth and the others around it. That tooth has a piece of filling missing, with some brownish stain, but I do not see dark decay. So what could this mean? I don't normally have sinus issues. This just started after eating cereal yesterday. Any professionals that can advise, I would really appreciate it. Calling DDS in the morning to get an exam. Thank you.

Help! Toothache or Sinuses or Root Canal or What?
The missing piece and stain could be a cavity, and it could be all the way into the nerve. Definitely call the DDS, you could have an infection.
Reply:Good job calling the DDS in the morning. I have a hard time believing that you can do a good hot/cold test at home, since I am a dentist, and I don't think I could do it on myself at home. An indication of sinus involvement is if it hurts when you move your head up or down. Best to have the dentist look at it. Because either way, you will need to rule out tooth ache vs sinus involvement.

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