Root Canal Treatment

Root canal treatment is a dental procedure that removes infected or damaged tissue from inside a tooth in order to save the tooth and relieve pain.

Inside every tooth there is a soft core called the pulp, which contains nerves and blood vessels. When bacteria reach the pulp — usually because of deep decay, a crack, or repeated dental work — the pulp becomes inflamed or infected and causes severe pain or abscess (a pocket of pus). During root canal treatment, the dentist cleans out all of this damaged pulp through the root canals (the narrow tunnels that run through the roots of the tooth), shapes and disinfects those canals, then seals them with a rubber-like filling material. This stops the infection and keeps the tooth in place so it can still be used for chewing.

Root canal treatment is recommended when the pulp inside a tooth is irreversibly damaged and cannot heal on its own. A dentist usually confirms this with X-rays and a clinical examination before deciding that the procedure is needed.

• Deep tooth decay that has reached the pulp
• A cracked or fractured tooth that has exposed the pulp to bacteria
• A dental abscess (infection that has spread to the root tip or surrounding bone)
• Severe toothache, especially pain that lingers after hot or cold stimulation
• A tooth that has been injured by trauma, even if it does not look broken
• Repeated dental procedures on the same tooth that have weakened or irritated the pulp
• A tooth that has died (no longer has a living pulp) but needs to be kept for functional reasons

Root canal treatment is generally not suitable in certain situations, and your dentist will discuss alternatives.

• The tooth is so badly broken down that it cannot be restored even after treatment
• The root canals are completely blocked and cannot be cleaned safely
• The surrounding bone has been so severely destroyed by infection that the tooth cannot be stabilised
• The patient's general health makes even a routine dental procedure unsafe — in such cases, extraction may be recommended instead

Root canal treatment is a well-established dental procedure, but like any treatment it carries some recognised risks, most of which are manageable when caught early.

• Post-procedure soreness or tenderness around the treated tooth for a few days, which is very common and usually settles with ordinary pain relief
• Swelling or mild infection in the surrounding gum or jaw, which is typically treated with antibiotics
• Re-infection of the tooth if bacteria enter the sealed canals again — this can happen if the final crown or filling is delayed or fails
• A fine instrument used to clean the canals can occasionally break inside the root (instrument fracture), which your dentist will assess and manage on a case-by-case basis
• A small hole (perforation) in the root wall if the anatomy is unusually curved or narrow, which may require additional treatment
• Incomplete removal of infected tissue if a canal is missed, particularly in teeth that have an unusually complex root system, sometimes requiring a repeat procedure
• Tooth discolouration over time, especially in front teeth, which can be addressed cosmetically
• In rare cases, the tooth may still need to be extracted if the infection persists or the tooth structure is too weak to survive

Root canal treatment usually does not require the same preparation as surgery under general anaesthesia (medicine that puts you fully to sleep), but your dentist will still give you specific instructions to follow in the days before your appointment.

Before the procedure, you may be advised to:

• Continue eating and drinking normally — fasting is not required because the procedure uses local anaesthesia (numbing injections in the mouth only)
• Let your dentist know about all medications you take, especially blood thinners or medications that affect the immune system, so the team can plan accordingly
• Avoid alcohol in the day or two before your appointment, as it can interact with some medications given during treatment
• If you smoke, your dentist may ask you to avoid smoking on the day of treatment, as it can slow healing of the surrounding gum tissue
• Get a good night's sleep and arrive for your appointment rested — the procedure can sometimes last an hour or more, and staying calm helps

Your dentist will usually take dental X-rays (periapical X-rays, which show the whole root and the bone around it) before starting. In complex cases, a three-dimensional cone beam CT scan (a specialised dental scan) may be requested to map the exact shape of the root canals.

During the procedure itself, the steps typically follow this order, though the exact number of visits can vary — some dentists complete the treatment in one visit, others prefer two or more:

• 1. Local anaesthetic is injected into the gum around the tooth to numb the area completely.
• 2. A rubber dam (a thin sheet of rubber) is placed over the tooth to keep it dry and free of saliva during the procedure.
• 3. The dentist drills a small opening through the top of the tooth to reach the pulp chamber inside.
• 4. Tiny flexible instruments are used to remove the infected or dead pulp from each canal and to shape the canals so they can be cleaned thoroughly.
• 5. The canals are flushed repeatedly with disinfectant solution to remove bacteria and debris.
• 6. The dentist checks the length and shape of each cleaned canal, usually with a small X-ray taken during the appointment.
• 7. If the infection is severe, the dentist may place a temporary medicated dressing inside the tooth and seal it with a temporary filling, then ask you to return for a second visit.
• 8. Once the canals are confirmed clean, they are filled with a rubber-like material called gutta-percha and sealed with dental cement.
• 9. A permanent crown (a cap that covers the whole tooth) or a strong filling is usually fitted at a later appointment to protect the treated tooth from cracking.

Most patients go home the same day and can return to normal daily activities within a day or two, but the treated tooth and the surrounding area will need some care while they heal. Your dentist will give you personalised instructions at discharge.

• Expect some soreness and mild swelling around the treated tooth for a few days — this is a normal part of healing. Your dentist will usually recommend ordinary pain relief to manage it.
• Avoid chewing hard or crunchy foods on the treated side until the permanent crown or filling has been placed, as the tooth is more vulnerable to cracking in the meantime.
• If a temporary filling was placed, be careful not to let it dislodge — avoid very sticky foods on that side.
• Keep the area clean by brushing and flossing gently as normal, taking care around the treated tooth.
• If antibiotics were prescribed for an active infection, complete the full course as directed by your dentist.
• Attend all follow-up appointments — the most important next step is usually fitting the permanent crown or strong filling to protect the treated tooth long-term.
• Contact your dentist promptly if you notice severe pain that does not improve after a few days, significant swelling, a bad taste or smell, or if the temporary filling falls out.
• Once the crown is in place, the treated tooth can usually function normally for many years with good oral hygiene and regular dental check-ups.
• If you smoke, your dentist may advise you to avoid smoking during the initial healing period to give the surrounding gum tissue the best chance to recover.