There is no single reason why a tooth hurts but it always signifies an underlying problem with the teeth or even the gums. Although the aching may be intermittent, or may even disappear over time, toothache should be taken as a wake-up call and the problem discussed with the dentist.
The toothache can usually be traced to one of several main causes:

- Tooth infection

- Damaged tooth enamel

- Chipped or cracked teeth

- Teeth grinding and gum disease

Whatever the reason your tooth will almost always get worse without treatment and the underlying cause should always be investigated. Find out more at https://yourdentalhealthresource.com/top-reasons-your-tooth-may-be-aching/