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Tooth ache.
What causes toothache?
Toothache occurs when the innermost layer of the tooth (dental pulp) becomes inflamed. The pulp is made up of sensitive nerves and blood vessels.
Dental pulp can become inflamed as a result of:
tooth decay – this leads to holes (cavities) forming in the hard surface of the tooth
a cracked tooth – the crack is often so small that it can't be seen with the naked eye
loose or broken fillings
receding gums – where the gums shrink (contract) to expose softer, more sensitive parts of the tooth root
periapical abscess – a collection of pus at the end of the tooth caused by a bacterial infection
There are a number of other conditions that can cause pain similar to toothache, even though the pulp isn't affected. These include:
periodontal abscess – a collection of pus in the gums caused by a bacterial infection
ulcers on your gums
sore or swollen gums around a tooth that's breaking through – for example, when your wisdom teeth start to come through
sinusitis – which sometimes causes pain around the upper jaw
an injury to the joint that attaches the jaw to the skull (temporomandibular joint
