Persisting toothache after seeing the dentist?

Question:

2 weeks ago, I went to the dentist after having a severe toothache. Routine check up and an x-ray where I claimed the teeth was hurting but nothing was found.
The teeth hurting are the ones usually very sensitive to hot/cold, I told the dentist this, to which he then said it may just be the sensitiveness working up, I was recommended to use toothpaste specific for sensitive teeth and it should get better. It didn't.
I now figured that the pain was coming from the nerves, rather than the teeth or gums as such. The pain comes on completely randomly but I almost always have a big episode just before I sleep. The pain is only on the left side. I do have sensitive teeth and gums so I won't rule that out as a possibility, it just doesn't look like that pain from sensitive teeth can be so persistent.
Do I really just have sensitive teeth or does it look like something else (e.g., root canal)? What else can I take/do to help sensitive teeth besides flossing and the stupid toothpaste??

Answers:
The dentist would know if you needed a root canal by the x -rays. It could be that you grind your teeth at night. If you have a cold that could be a reason. Make sure you brush with a soft bristled tooth brush. Don't scrub your teeth, this can wear away enamel. Brush in little circles. You can also apply the sensitive teeth toothpaste with your finger to the specific teeth when needed. If you absolutley can't stand it, go see another dentist. Tell them the dentist you saw last and they can have the x-rays sent over to them before your appointment. It doesn't hurt to get a second opinion, I have worked with some terrible dentists I myself would never go to.

You need a second opinion. Toothache is the worst and you can't live like that. Also he has stuff that he can put on sensitive teeth which he didn't. He's a quack, go to someone else.

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Persisting toothache after seeing the dentist?

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