Dental emergency · Valleyfield
Painful wisdom tooth or swollen gum at the back of the mouth in Valleyfield
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01In brief
Painful wisdom tooth: what should I do?
Get it seen quickly
A painful wisdom tooth with swollen gum at the back of the mouth often points to an infection of the gum covering the tooth (pericoronitis). Rinse with lukewarm salt water, gently clean the area and call the Go Dentiste clinic in Valleyfield at 514-533-3368 to be seen quickly, the same day (subject to availability) if you have trouble opening your mouth or your cheek is swelling. If you have trouble swallowing or breathing, go to the hospital emergency room.
- ClinicGo Dentiste Valleyfield
785 Monseigneur-Langlois Boulevard, Salaberry-de-Valleyfield - Phone514-533-3368
- HoursOpen 7 days a week: Mon 8 a.m.–5 p.m., Tue 8 a.m.–7 p.m., Wed–Thu 8 a.m.–5 p.m., Fri–Sun 9 a.m.–2 p.m.
- OnlineBooking 24/7
- Time to treatmentSame day, subject to availability
- New patientsWelcome, no referral needed
02What to do now
What to do in the meantime
- Rinse with lukewarm salt waterHalf a teaspoon of salt in a cup of lukewarm water, several times a day, especially after meals.
- Clean gentlyBrush gently around the tooth: debris stuck under the gum keeps the inflammation going.
- Cold on your cheekA wrapped cold compress, 15 minutes at a time.
- Call the clinicMention it if you have trouble opening your mouth or swallowing, or if you have a fever.
What to avoid
- Putting heat on your cheek
- Piercing the gum or trying to remove the tooth
- Smoking or vaping
- Counting on an antibiotic alone to fix the problem
Warning signs: Call 911 or go to the hospital emergency room (Hôpital du Suroît, in Valleyfield) if swelling spreads to the eye, under the jaw or to the neck, if you have trouble breathing, swallowing or opening your mouth, or if you have a high fever.
New patients · First visit
Your complete checkup, in a single visit.
A 45- to 75-minute visit
- Complete exam service and low-dose X-rays
- Cleaning service, the same day when possible
- Written treatment plan, every cost explained
- Coming as a family? Grouped appointments on request: a single trip
Vaudreuil-Dorion just opened: openings for new patients
03Is it urgent?
Hospital, clinic or appointment: how to decide
- Hospital or 911Swelling spreading to the eye or neck, trouble breathing, swallowing or opening your mouth, high fever: hospital emergency room or 911.
- Clinic, todaySwollen, painful gum behind the last molar, bad taste, slight trouble opening: call to be seen today, subject to availability.
- In the next few daysOccasional discomfort while the tooth is coming in, with no swelling: book an assessment with an X-ray.
04At the Valleyfield clinic
How an infected wisdom tooth is treated
The dentist examines the area, cleans and rinses under the gum, then takes an X-ray to see the position of the wisdom tooth.
Depending on the case, the dentist first relieves the infection, then plans the extraction once the inflammation has gone down, or refers you to an oral and maxillofacial surgeon if the tooth is deeply impacted. An antibiotic may be prescribed if the infection is spreading.
Directions to the Valleyfield clinic
Opening hours
Valleyfield
| MondayMon | 8 a.m. – 5 p.m. |
|---|---|
| TuesdayTue | 8 a.m. – 7 p.m. |
| WednesdayWed | 8 a.m. – 5 p.m. |
| ThursdayThu | 8 a.m. – 5 p.m. |
| FridayFri | 9 a.m. – 2 p.m. |
| SaturdaySat | 9 a.m. – 2 p.m. |
| SundaySun | 9 a.m. – 2 p.m. |
05Possible treatments
Services that may be offered to you in Valleyfield
The treatment depends on the exam: the dentist explains the options and their costs before starting.
06FAQ
Frequently asked questions: painful wisdom tooth
What is pericoronitis?
It is an infection of the gum that partly covers a tooth that is coming in, most often a lower wisdom tooth. Debris and bacteria build up under this flap of gum.
Does an infected wisdom tooth need to be removed?
Not always, but an infection that keeps coming back is often a reason to extract it. The dentist explains the options after the exam and X-ray.
Can the tooth be extracted during the infection?
It depends on the infection and the position of the tooth. Often, the infection is relieved first and the extraction is planned afterwards.
Why do I have trouble opening my mouth?
The inflammation can spread to the jaw muscles. This is a sign to take seriously: get seen quickly, and go to the hospital if you also have trouble swallowing or breathing.
07See also
Other dental emergencies in Valleyfield
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A dental emergency in Valleyfield? Call or book.
Same-day emergencies (subject to availability), 7 days a week at the Valleyfield clinic. New patients welcome, online booking 24/7.
Content prepared by the Go Dentiste team (Dr Dominic Morel-Maynard, general dentist and owner). Last updated: October 11, 2026. General information for guidance only: only an in-clinic exam can establish a diagnosis and a treatment plan suited to your situation. For health advice 24/7, call Info-Santé 811; in a serious emergency, call 911. Services are offered in French and English.