Written by Richard Dawson, DMD ICOI Fellow Reviewed by John Turke DMD Updated May 2026

Patient Resources -- Smile Science Dental Spa, Glendale AZ

Root Canal Post-Operative Instructions

Managing sensitivity, temporary crown care, and what to expect during the days after your root canal.

When to Call Our Office

Contact us immediately at (480) 530-3663 if you develop a fever, experience swelling around your jaw or face, notice visible swelling inside your mouth, have pain that is worsening rather than improving after 3 days, or if your temporary crown falls out. For a medical emergency or difficulty swallowing or breathing, dial 9-1-1.

3 Rules for Today

Wait for the numbness to fully resolve before eating -- usually 2 to 4 hours after your appointment.

Protect the temporary crown -- no sticky or hard foods until your permanent crown is placed.

Schedule your permanent crown within 4 to 6 weeks -- the tooth is not fully protected until then.

Smile Science Dental Spa 20118 N 67th Ave Ste 308, Glendale, AZ 85308
(480) 530-3663 • smilescience.com

A root canal removes infected or inflamed tissue from inside the tooth and seals the root canals to prevent reinfection. The procedure relieves the pain caused by pulp infection, but some post-procedural soreness is expected as the tooth and surrounding tissue recover. These instructions will help you manage that recovery and protect the tooth until the permanent restoration is placed.

Immediately After Your Appointment

Wait to eat until the numbness resolves. Local anesthetic typically wears off in 2 to 4 hours. Eating or drinking hot liquids while numb increases the risk of accidentally biting your cheek, tongue, or lip without realizing it.
Temporary crown or filling: A temporary restoration has been placed to protect the tooth until your permanent crown appointment. Treat it carefully -- it is not as durable as your final restoration.
Begin pain medication now. Take ibuprofen 400 mg (or your prescribed medication) before the anesthetic wears off. Do not wait until pain begins. Staying ahead of inflammation makes recovery more comfortable.

Days 1 through 3

Sensitivity and soreness are normal. The tooth and the bone around it may be tender for 2 to 5 days. This soreness reflects normal post-procedural inflammation -- not a sign that the root canal failed.
Pain management: Alternate ibuprofen 400 mg (every 6 hours) with acetaminophen 500 mg (between ibuprofen doses) for steady coverage. These dosages are for healthy adults. Follow prescription instructions if provided.
Avoid chewing on the treated side. Until the permanent crown is placed, the tooth is more susceptible to fracture. Chew on the opposite side whenever possible.
Avoid hard, sticky, and crunchy foods entirely during this period: nuts, chips, hard candy, caramel, gum, bagels, and ice. These can dislodge or fracture the temporary crown.
Bite test: The tooth may feel slightly high after treatment due to post-procedure inflammation. This usually resolves within a few days as swelling subsides. If the bite feels significantly off after 3 days, call us to have the occlusion checked.

Days 4 through 14

Oral hygiene: Brush and floss normally. Floss gently around the temporary crown by sliding it out rather than snapping it through -- snapping can pull the temporary restoration loose.
Sensitivity to hot and cold may persist for several weeks after root canal treatment. This is a normal inflammatory response and does not indicate treatment failure. If sensitivity becomes severe or worsening, call us.
If the temporary crown falls out: Call our office immediately. The tooth is unprotected without its temporary covering. Avoid eating on that side and contact us the same day if possible.
Antibiotics: If prescribed, take the complete course even if you feel better. Do not stop early.

The Permanent Crown

Schedule your crown appointment within 4 to 6 weeks. A root canal-treated tooth is brittle and more susceptible to fracture without a crown. Delaying the crown puts the tooth at risk of breaking and potentially becoming unrestorable.
Without a permanent crown, bacteria can re-enter the treated root canals through gaps in the temporary material. The permanent crown seals the tooth and prevents reinfection.
After your permanent crown is placed, the tooth can function normally without dietary restrictions.

Warning Signs -- Call Our Office

Fever at any point after root canal treatment -- this should not occur and requires prompt evaluation.
Visible swelling inside your mouth or on your face or jaw. Swelling after a root canal is uncommon and may indicate a developing abscess.
Pain that is worsening after Day 3 rather than gradually improving.
Temporary crown falls out -- the tooth needs to be re-covered promptly.
A crack or fracture in the treated tooth -- do not wait; call the same day.

Questions at any stage of your recovery are welcome. Our team at Smile Science Dental Spa is here to help. Call us at (480) 530-3663 or visit us at 20118 N 67th Ave Ste 308, Glendale, AZ 85308.

Root canal treatment at Smile Science Dental Spa is performed by Dr. Richard Dawson, DMD, ICOI Fellow, and reviewed in collaboration with Dr. John Turke, DMD. If you have questions specific to your case or your recovery is not progressing as expected, call us at (480) 530-3663. To learn more about root canal treatment and what to expect, visit our root canal page.

Frequently Asked Questions

Is it normal for my tooth to hurt more the day after the root canal?

Yes, some patients experience a temporary increase in sensitivity or soreness in the first 24 to 48 hours after treatment. This is called a "flare-up" and is caused by post-procedural inflammation in the tissues surrounding the tooth. It does not mean the root canal failed. Managing inflammation with ibuprofen and acetaminophen alternated throughout the day is the most effective approach. If the pain is severe or worsening after Day 3, contact us.

What do I do if the temporary filling feels like it came out?

Call our office right away. The temporary restoration protects the root canals from bacterial contamination. If a significant portion of the filling is lost, the tooth needs to be re-temporized as soon as possible. In the meantime, avoid chewing on that side and do not attempt to replace the material yourself. We keep time available for urgent situations like this.

Can a root canal-treated tooth last a lifetime?

Yes -- root canal-treated teeth that receive a proper crown and ongoing preventive care can last a lifetime. The most important factors are placing the permanent crown promptly (within 4 to 6 weeks), maintaining good oral hygiene, and attending regular cleanings and exams. Teeth that are left uncrowned after root canal treatment are significantly more likely to fracture and require extraction.

Do I need to take antibiotics after a root canal?

Not always. Antibiotics are prescribed when there is evidence of spreading infection -- such as swelling that extends beyond the tooth, a fever, or infection in the surrounding bone. Routine root canals on teeth without active spreading infection do not require antibiotics. The root canal procedure itself eliminates the source of the infection by removing the infected pulp. If antibiotics were prescribed for you, complete the full course as directed even if you feel better sooner.

Can I go to work the same day as my root canal?

Many patients return to work the same day or the next day after a root canal. The procedure itself is typically no more uncomfortable than a filling. Post-treatment soreness is usually manageable with over-the-counter pain medication. If your work is physically demanding or involves significant activity, you may prefer to rest on the day of treatment and return the following day. Avoid eating until the numbness has fully resolved -- typically 2 to 4 hours -- to prevent accidentally biting your cheek or lip.

Why did the dentist say I need a crown after my root canal? Can I skip it?

Skipping the crown significantly increases the risk of tooth fracture and ultimately losing the tooth. Root canal treatment removes the pulp, which reduces the tooth's internal moisture and makes it more brittle over time. A crown distributes biting forces across the entire tooth surface and protects it from cracking. Posterior teeth (molars and premolars) are under the most stress and are the most likely to fracture without a crown. Front teeth may be an exception -- ask us whether your specific tooth requires full coverage or if a different restoration is appropriate.

These instructions were prepared by Dr. Richard Dawson, DMD, ICOI Fellow, and reviewed by Dr. John Turke, DMD. If your situation does not match what is described here, trust your clinical team -- call us at (480) 530-3663.

Questions or Concerns?

Contact our office any time during your recovery. We are here to help.

Call Our Office: (480) 530-3663