AFTER A ROOT CANAL: MORE ABOUT THIS
This page goes with the sheet we texted you. That sheet has the things you may need tonight. This page has everything else: what we actually did, what to expect over the next few weeks and months, and the questions parents ask us after they get home.
If something is wrong right now, use the red flag box on your instruction sheet.
FIRST, THE THING PARENTS ASK US ALMOST EVERY TIME
No, you did not cause this.
A tooth needs this treatment because of a deep cavity, a crack, or a knock to the mouth, and often because of how the tooth formed years before anyone could see a problem. No parent controls all of that. You brought your child in, and we are taking care of it.
WHAT WE DID TODAY
We cleaned the nerve out of the whole tooth, including the roots, cleaned and shaped the canals, and sealed them. This is a root canal treatment.
Right now there is a temporary filling in the tooth. The tooth is not finished. It needs a permanent crown to protect it.
WHY WE WANT THE CROWN ON IN 4 TO 8 WEEKS
Two reasons.
A tooth after a root canal is more brittle than it used to be. The inside of the tooth is what made it flexible. A crown wraps the tooth and takes the force of chewing off the walls.
A temporary filling is not a long term seal. Temporary fillings are built to last weeks, not months. There is no exact expiration day, so please do not count down on a calendar. The goal is to get the crown on before the temporary has to work that hard.
Where the timing comes from. In adult patients, a root canal treated tooth that got a crown lasted better than one that got only a filling, and better than one that got nothing at all. That is the part that matters. The 4 to 8 week window itself is our margin of safety. It is not a deadline proven by a study, and the research it draws on was done in adults, not teenagers. We would rather be early than find out where the edge is on your child’s tooth.
IF THE TOOTH FLARES UP
Most children are just sore to biting for a few days. A small number of patients get what we call a flare-up, which means a bad ache or swelling that starts in the days after treatment.
It happens to about 3 out of every 100 people in the first days after a root canal. That number comes from mostly adult root canal patients, and we do not have an equivalent number for children and teenagers.
Two things make a flare-up more likely: the tooth aching on its own before treatment, and the tooth being very sore to tap on before treatment. If either of those was true for your child, watch a bit more closely in the first few days.
If a flare-up happens, call us. Do not wait it out.
DOES MY CHILD NEED AN ANTIBIOTIC?
Often, no.
A root canal treats the infection by cleaning it out of the inside of the tooth. That is the treatment. An antibiotic on its own does not fix a tooth, because it cannot reach the inside of a tooth where the blood supply is gone.
If we gave you a prescription today, use all of it, even after your child feels fine. Stopping early is how the part that is left over gets harder to treat.
If we did not give you one, that is a choice, not an oversight. We do not prescribe antibiotics for ordinary soreness after a root canal.
Call us if things change, especially if the gum or face swells, if a fever starts, or if the pain gets worse instead of better after the first 2 days. Those are the situations where the answer might be different, and we would want to see your child rather than call something in.
An antibiotic is never a substitute for the crown appointment.
HEALING AT THE ROOT TIP
If the X-ray showed a dark spot at the end of the root, that is bone that infection ate away. We look for it to be filling in over the next several months.
It is slow, and it is checked with X-rays at follow up visits, not by how your child feels. Your child can feel completely fine while that area is still healing. That is normal, and it is not a sign that something was missed.
SCHOOL, SPORTS, AND NORMAL LIFE
Can my child go to school tomorrow? Yes. Most children and teenagers go back the next day, and many are fine to go back the same day once the numbness is gone.
Lunch. Send soft food, or food that can be chewed on the other side. Nothing crunchy in the lunchbox until the permanent crown is on.
Sports and PE are fine once your child feels up to it. If your child plays a contact sport, tell us and we will talk about a mouthguard, because the tooth has a temporary filling in it.
If your child also had sedation today, use the conscious sedation sheet for that answer instead. Sedation has its own timeline.
WHAT TO WATCH FOR OVER THE NEXT SEVERAL MONTHS
A treated tooth can fail quietly, months after it stops being sore. Call us if you notice any of these at any point:
- Pain, especially pain at night or pain when biting down
- A small pimple on the gum near the tooth. It may drain, go away, and come back. That is drainage from an infection, and it needs to be seen even though it does not hurt.
- Swelling of the gum or the face
- The tooth turns dark gray or brown
- The temporary filling or the crown feels loose or comes off
- A bad taste or smell coming from that area
LONG TERM
A root canal treated permanent tooth can last many years. What we know about that comes from adult patients, and we do not have equivalent numbers for teenagers. If you read a 10 year survival number online, that is an adult number.
What we can tell you is what this tooth needs:
- The crown
- Brushing and flossing like any other tooth
- An X-ray at least once a year to check the area under the root
Usually the regular checkup X-rays cover that. That yearly check is how a problem gets caught before it hurts.
MORE ABOUT PAIN MEDICINE
Use the pain medicine card we sent you. If you do not have it, call us. Do not guess at a dose. The card is the only place we print doses, so that there is one set of numbers and not three.
Do not give your child codeine or tramadol, including leftovers from another illness or a prescription belonging to someone else. The FDA says codeine and tramadol should not be given to any child under 12, and should not be given to anyone under 18 after tonsil or adenoid surgery.
Never give aspirin to a child unless a doctor told you to.
Keep all medicine up and out of reach. Poison Control: 1-800-222-1222.
Reviewed August 2026