Sometimes old injuries that you think is minor may come back then that would be the only time you will realize how much damage there is on the nerve of that tooth. In other cases a tooth on its own and without any signs can become inflamed, hurt and even die. This is very similar to appendicitis, you will never know when it's going to happen then you would need to have a dentist or orthodontist take care of that tooth.
Meanwhile, a slight or dull ache in your may have been caused by the gnashing and grinding that you unconsciously do while you are sleeping. The gnashing and grinding of teeth is usually a sign of tension that can unfortunately lead to toothache. Or toothache can be a symptom of a sinus issue, but it is not easy to find which tooth it is. This takes place because the roots of the upper teeth go all the way into the sinus hence any pressure in there affects the tooth nerves.
Anyway, for painful situations like these a toothache remedy is often in order. But a toothache remedy is more often than not just a bandage solution. If you really want to take care of your toothache, you can go directly to your dentist to solve your problems once and for all. But before doing so, you may want to pop up some ibuprofen to ease that toothache. After all whether a tooth is just injured or dead, you will still feel some inflammatory pain. Ibuprofen is not only to get but has good anti-inflammatory properties to help with that pain. Don't use aspirin or acetaminophen on your toothache these will not be able to do much.
Don't ever ignore a toothache even if it eventually goes away because it will definitely come back and sometimes it can become more painful. When a toothache goes away this usually indicates that the decay or the trauma has killed the nerve. What follows next is a pus-filled abscess that leads to more pain. You might be surprised to wake up one day with a swelling on your face accompanied by severe pain. Never think that just because the pain is gone the tooth is fine.
Knowing all these, remember you have the option on how you should take care of your tooth ache. You can either choose a toothache remedy or have your dentist check on that tooth. The choice is yours