See someone urgently if
- Swelling closing the eye, or spreading under the jaw or into the neck
- Difficulty swallowing, or drooling because you cannot swallow saliva
- Difficulty breathing, or a change in your voice
- Inability to open the mouth more than a couple of centimetres
- Fever, shivering, or feeling systemically unwell alongside the swelling
- Swelling that is visibly increasing hour by hour
Otherwise, book in the normal way. Call +91 83036 12717.
What causes it
A dental abscess at the root tip
The usual cause. Bacteria from a dead pulp exit the root tip into the surrounding bone, pus collects, and once it breaks through the bone it spreads into the soft tissue of the face. The tooth may have stopped hurting before this happened, because the nerve is already dead.
A periodontal abscess
Infection in a deep gum pocket rather than inside the tooth. It develops faster than a root-tip abscess, and the tooth is usually already loose.
Pericoronitis around a wisdom tooth
Infection under the gum flap over a partly erupted lower wisdom tooth. This one is particularly prone to spreading into the tissue spaces of the neck, and it is a common origin of the serious presentations.
Infection after an extraction
Uncommon, but a socket that becomes infected and starts to swell rather than settle over the days after an extraction needs to be seen rather than waited out.
Why it spreads the way it does
Pus takes the path of least resistance through the tissue planes of the face and neck. Which direction it takes depends on which tooth it came from and where the root tip sits relative to the muscle attachments. The dangerous directions are backwards and downwards, towards the airway.
What helps before you are seen
Do not apply heat to the swelling
Warm compresses on a swollen face encourage the infection to spread through the tissues. This is a common piece of household advice and it is the wrong instruction here.
Do not try to squeeze or lance it
It pushes bacteria further into the tissue planes. Drainage is done under controlled conditions.
Painkillers, and keep hydrated
Standard painkillers you tolerate. Keep fluids up, as people with painful swelling stop drinking and become dehydrated quickly.
Go now, do not wait for a routine slot
This is the one dental problem where the time you spend deciding is itself the risk. If any of the red flags above apply, go to a hospital emergency department rather than waiting for a dental appointment.
How it is treated
Drainage, which is the actual treatment
Pus has to come out. That is done through the tooth, by opening the pulp chamber, or through an incision in the gum or, where the infection has spread, extraorally. Relief once it drains is immediate and dramatic.
Antibiotics as an adjunct, not a substitute
Antibiotics support drainage and control spread. They do not clear a collection of pus on their own, because the drug cannot penetrate it adequately. A course of antibiotics without drainage typically settles the swelling temporarily and it returns.
Treating the source tooth
Root canal treatment or extraction. Until the source is dealt with, the infection recurs. This is why a course of antibiotics from a pharmacy is a delay rather than a treatment.
Hospital admission where the airway is threatened
Ludwig's angina, an infection spreading through the floor of the mouth, and infections tracking into the deep neck spaces are managed in hospital with intravenous antibiotics and surgical drainage. These are genuine emergencies and they begin as toothache.
Afterwards
Once the acute episode is resolved, the underlying dental problem still needs definitive treatment, and this is the point to address why it happened, which is usually untreated decay or gum disease elsewhere in the mouth too.
Facial swelling from a tooth: common questions
Is facial swelling from a tooth dangerous?
It can be. A dental abscess spreading into the tissue spaces of the face and neck is the dental problem most likely to become life-threatening, because those spaces lead towards the airway. Swelling closing the eye, spreading under the jaw, or accompanied by difficulty swallowing or breathing needs emergency hospital care the same day.
Will antibiotics clear a dental abscess?
Not on their own. Antibiotics control spread and support treatment, but they cannot penetrate a collection of pus adequately. The pus has to be drained and the source tooth treated. A course of antibiotics alone typically settles the swelling temporarily, after which it returns.
Should I put a hot compress on a swollen face?
No. Heat encourages a dental infection to spread through the tissue planes. This is common household advice and it is wrong for facial swelling of dental origin. Get it seen instead.
My tooth stopped hurting but my face is swollen. Why?
Because the pulp has finished dying, so the nerve that was generating the pain is gone. The infection then progressed out of the root tip into the surrounding bone and tissue. Pain stopping is not recovery, and swelling afterwards is the expected next stage.
How quickly does a dental abscess need treating?
Same day where there is facial swelling. Within twenty-four hours where there is a localised gum swelling without facial involvement, no fever and no difficulty swallowing. The rate of change matters: swelling visibly increasing hour by hour should be treated as an emergency regardless.
Medically reviewed
Reviewed by Dr. Dhanya Saxena, BDS, MHA, FMC, FAOI, oro-dental surgeon and aesthetic physician at Redefine Dental and Facial Aesthetic, Indira Nagar, Lucknow. Dental Council registration 20935. Last reviewed 30 August 2026.
This page is general information, not a diagnosis. Prices are prevailing Lucknow market ranges, not a quotation. If you have facial swelling, difficulty swallowing or difficulty breathing, seek emergency medical care rather than a routine appointment.