Is Root Canal Treatment PAINFUL?
Endodontics

Is Root Canal Treatment PAINFUL?

Root canal treatment under local anaesthesia feels similar to a regular filling. See what happens at each step and how to care for your tooth afterwards.

Faced with the unknown, people always feel uneasy and fearful. When a dentist recommends a root canal treatment, most patients are very worried and fearful, and may wonder how much pain they will have to endure. Knowing the treatment methods of root canal treatment in advance can help eliminate the anxiety of the unknown and reduce the anxiety about any dental treatment.

Does root canal treatment hurt?

Local anesthesia is usually given to relieve pain during the procedure. The overall treatment experience and pain level are similar to those of general dental fillings. However, root canal treatment usually takes longer than that of other dental procedures, because it involves cleaning the pulp and repairing the tooth structure.
 

Is Root Canal Treatment PAINFUL?

The general treatment process is as follows:

1.    Anesthesia: At the beginning of the treatment, topical anesthesia gel is first applied to the gums around the teeth to temporarily numb the area, and then an anesthesia needle is administered for local anesthesia.

2.    Isolate the teeth: When the anesthesia starts to work, place a barrier clip and a dental barrier around the teeth to provide a good isolation and clean treatment area for the teeth, and isolate the saliva and bacteria in the oral cavity from the teeth to be treated.

Is Root Canal Treatment PAINFUL?


3.   Clearing the infection: Using a specially designed dental tool such as a root canal file to remove the pulp along with the infected tissue so that the tooth is no longer painful.

4.   Root canal modification: measure the depth of the root, and use a root canal file to make appropriate modification and enlargement if necessary to provide space for root canal filling and ensure that the filling can reach the tip of the root.

5.    Root canal irrigation: Rinse and disinfect with antiseptic and antibacterial solutions in preparation for root canal filling.

6.    Sealing the root canal: A sterile root canal filler is placed and filled with thermoplastic materials to seal the tooth with heat to prevent reinfection. Fiber posts are placed to reinforce the internal structure of the tooth if necessary.

What happens after the root canal treatment?

Taking medication: After the treatment, antibiotic medication prescribed by your dentist is required to prevent any infection in the treated area. 

Mild discomfort: There is usually some discomfort after the treatment is completed, which will subside as the gums and affected teeth recover. 

Careful protection: Newly restored teeth will not be as strong as they used to be and must be protected with braces for complete restoration. Before getting braces on, you should use your teeth with extreme care and don't bite hard objects.

Post-operative care of the treated tooth

The purpose of the root canal treatment is to protect the true teeth and prevent the spread of infection. Here are some post-operation care tips and precautions:

-  Do not eat with the treated tooth, and choose food to avoid anything that requires chewing with the newly restored tooth. 

-  Wait until the anesthesia disappears before eating to avoid biting yourself. 

-  Do not bite or chew with your newly restored teeth until they are covered by a dental crown to prevent damage to your newly restored teeth. 

-  Brush and floss daily to maintain oral health and prevent inflammation or infection in the treated area. 

-  If there is any throbbing or swelling, consult your dentist as soon as possible.

Although root canal treatment is not 100% pain-free, the use of local anesthesia during the operation can make you not feel any pain, and the discomfort during the treatment is generally tolerable. Therefore, do not delay treatment because of fear of pain, miss the opportunity to save your teeth, as in doing so you may need more treatments to fix the problem in the future.

When the tooth decay is serious but you want to keep the original tooth, as long as the tooth condition permits, root canal treatment will be an alternative to tooth extraction. If you have any doubts about root canal treatment, please contact your trusted family dentist.
 

Article Info

First published: 22 December 2021

Last reviewed: August 2026

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FAQ

Frequently Asked Questions

  • Does root canal treatment hurt?

    Local anaesthesia is given at the start, so you won't feel pain during the procedure. The experience is similar to getting a filling, though root canal treatment takes longer because it involves cleaning the pulp and repairing the tooth structure. Some mild discomfort may occur after the anaesthesia wears off, but this subsides as the area heals.

  • How much does root canal treatment cost?

    Root canal treatment typically starts from HK$7,000 per tooth, with the final cost depending on the complexity of your case and whether additional work such as a crown is needed. Long-term success depends on locating every canal (upper molars often have a fourth), cleaning curved canals to working length and sealing the filling — incomplete treatment can re-infect, and re-treatment costs more than the first. After a clinical assessment we explain the fee components clearly, and treatment starts only with your consent. We provide a personalised quote after a clinical assessment — WhatsApp us to arrange a consultation.

  • How long does the entire root canal procedure take?

    Root canal treatment usually takes longer than a standard filling because it involves multiple steps: anaesthesia, isolating the tooth, clearing the infection, modifying and irrigating the root canal, then sealing it. The procedure itself can take one to two hours depending on the tooth, and you may need a follow-up visit for a crown.

  • What should I avoid eating after root canal treatment?

    Wait until the anaesthesia wears off before eating to avoid biting yourself. Do not chew with the treated tooth until it is covered by a dental crown, as the newly restored tooth is weaker than before. Choose soft foods and avoid anything that requires heavy chewing on that side.

  • Are there any risks or side effects after the treatment?

    Mild discomfort is normal after root canal treatment and will subside as the gums and tooth recover. If you experience throbbing pain or swelling, consult your dentist as soon as possible. Following post-operative care instructions — such as taking prescribed antibiotics and avoiding hard foods — helps prevent complications.

  • Will I need a crown after root canal treatment?

    Yes, in most cases a dental crown is recommended to protect the treated tooth. Root canal treatment removes the pulp, which can make the tooth more brittle. A crown reinforces the tooth structure and prevents it from breaking during normal chewing. Your dentist will advise you on the best timing for placing the crown.

Still wondering about something? Our team is happy to chat.

Reminder: You have the right to choose a Hong Kong dentist based on your individual needs. We recommend referring to the list of registered dentists published on the official website of the Dental Council of Hong Kong to make a choice best suited to your personal needs. The above content is intended to give you a brief introduction to the nature and effects of the relevant dental procedures, so that you can make informed decisions when choosing a dentist and related treatment options. All treatments have advantages and disadvantages — the key is that you must have a basic understanding of different treatments and procedures and be aware of the associated risks. The above content does not represent the professional opinion or views of any dentist or dental institution. For the sake of your health, please consult your family dentist for formal medical advice.

This article is compiled by the Public Education Team of Home Dental and has been reviewed and approved by the Content Review Committee of Home Dental. The Committee comprises members of our Board of Directors, legal advisors, and relevant professionals, and is responsible for vetting all externally published health education content to ensure it is professional, accurate, relevant to the local context, and regularly updated to meet Hong Kong dental service standards.

This content is originally produced by Home Dental, all rights reserved. Unauthorized reproduction, modification, or publication is prohibited. Violators will bear legal responsibility. For citation or partnership inquiries, please contact our center for written permission.

Last updated: Aug 2026

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