New fillings can be sensitive to hot and cold liquids and other foods for the first four to six weeks after, which the sensitivity .usually decreases
For large fillings / fillings which are very deep (near to nerve), there can be some inflammation in the tooth making it more sensitive to contact.
Sensitivity can also be due to a high spot on the filling that needs adjusting or maybe the nerve is degenerating due to the close proximity of the cavity resulting in irreversible pulpitis.
Sometimes it’s just a reaction of the nerve to the work that was done around it.
New fillings can be sensitive to hot and cold liquids and other foods for the first four to six weeks after, which the sensitivity usually decreases. This is especially when the filling is very large or deep (near the nerve). During the initial healing stages, you may take a painkiller. If the sensitivity continues for an extended period of time or if the discomfort is extreme, call your dentist so that he/she can evaluate the situation and prescribe an appropriate therapy.
Typical symptoms of tooth decay (cavities) include
When the tooth has an infection, it means that the nerve of the tooth (the pulp) is inflamed, usually as a result of dental decay. Inflammation is the body’s natural response to infection or injury.
Initially, this produces a short sharp pain brought on by hot, cold, or sweet foods and drinks; at this stage it is still reversible.
However, if left untreated, the inflammation progresses and become irreversible and you may experience a throbbing pain of increasing severity. The pain usually lasts several minutes and can also occur spontaneously, particularly at night.
As irreversible pulpitis progresses, the pulp may die and you may experience some temporary relief of pain. However, bacterial infection of the dead pulp can cause a continuous intense pain that affects your sleep.
This can result in an abscess, which is a collection of pus, and you may notice a painful swelling on the gum next to the affected tooth or on the outside of the face. The tooth will be very painful to touch, and you may also feel unwell or have a fever.