Why Teeth Become Sensitive and What Helps
Published by The Seoul Dental Clinic · Meet the dentists
Sensitive teeth usually mean the protective layer has thinned or the root is exposed, so cold, heat, sweetness or air reach the nerve more easily. Some causes are simple to manage at home, others need a filling or gum care. A short examination tells you which one you have.
What is happening inside the tooth
Under the hard enamel lies dentin, which contains tiny channels leading toward the nerve. When enamel wears down or gum recedes and exposes the root, those channels let temperature and sugars trigger a brief, sharp sensation.
Brief and sharp, gone within moments, usually points to exposed dentin. Lingering throbbing, pain that wakes you at night or swelling points toward a deeper problem, such as decay reaching the nerve, and needs earlier attention.
Common causes
Enamel wear
Acidic drinks, frequent snacking and hard brushing slowly thin the enamel.
Gum recession
When gums pull back, the softer root surface is exposed. Gum disease and aggressive brushing both contribute.
Cavity or cracked tooth
Decay or a hairline crack can allow stimuli to reach the nerve, often in one specific tooth.
Clenching and grinding
Constant pressure wears and flexes teeth, causing sensitivity near the gumline.
Recent dental work or whitening
Some people notice short-lived sensitivity after whitening or a new filling. Tell your dentist if it does not settle.
What you can try at home first
Switch to a soft brush and light pressure, and brush with toothpaste made for sensitive teeth for a few weeks. Spit rather than rinse straight after to let the active ingredient stay on the teeth.
Cut back on frequent acidic or sugary drinks, and wait a while after them before brushing. If the sensitivity does not ease, or it is limited to one tooth, home care is not enough and you should be examined.
Treatments a dentist may suggest
| Cause found | Possible approach | Published price |
|---|---|---|
| Plaque and tartar irritating gums | Professional scaling | Insurance-covered per national rules; additional scaling ₩50,000 |
| Small cavity or worn notch | Resin filling | ₩70,000–₩250,000 |
| Larger damaged area | Inlay or onlay | ₩200,000–₩330,000 |
| Heavily damaged tooth | Crown (zirconia, PFM or metal) | ₩300,000 (metal) – ₩550,000 (zirconia, front tooth) |
| Clenching | Habit advice and a night appliance | Quoted after examination |
| Deep infection of the nerve | Root canal treatment | Quoted after examination |
Published non-covered prices. Zirconia crowns are ₩450,000 for a back tooth and ₩550,000 for a front tooth; PFM ₩400,000. The right treatment depends on your case and is confirmed at consultation.
When to see a dentist soon
Do not wait if you have pain that lingers after hot or cold, pain on biting, a swollen gum, a bad taste, or a visibly broken tooth. These point to causes that toothpaste will not fix.
If you are only visiting Korea for a short time, tell us when you book so we can look at the problem early in your stay.
Questions to ask at your visit
Ask which tooth or teeth are involved, what the likely cause is, and whether the problem is expected to progress if left alone. A clear explanation lets you weigh a small repair now against a bigger one later.
Also ask what you can do at home between now and any treatment, which products to avoid, and how soon to return if the sensitivity changes. Bring a note of which foods or temperatures trigger it, since patterns help the dentist narrow down the cause quickly and avoid unnecessary steps.
Visiting us near Taepyeong Station
The Seoul Dental Clinic is by Taepyeong Station Exit 5 in Sujin-dong, Sujeong-gu, Seongnam. English consultation is available, and the dentist will explain findings and prices before any treatment begins.
Frequently asked questions
Why are my teeth suddenly sensitive?
Common triggers are receding gums, enamel wear, a new cavity or a crack. A quick exam can usually tell which.
Will sensitive teeth go away on their own?
Mild sensitivity from habits can settle with care. Sensitivity from decay or a crack does not and tends to get worse.
Is sensitivity after whitening normal?
Short-term sensitivity can happen. If it lasts or becomes sharp, contact the clinic.
Can sensitive teeth be a sign of grinding?
Yes, clenching and grinding can wear teeth and cause sensitivity near the gumline.
How much does it cost to treat?
It depends on the cause. Additional (non-covered) scaling is ₩50,000 and resin fillings range ₩70,000–₩250,000 on the published list; other treatments are quoted after examination.
English-speaking dentists in Seongnam
The clinic was founded by two brothers trained at Seoul National University who direct it together. Three further dentists hold Ministry of Health and Welfare specialist certifications. Full credentials →
Dr. Hyun Sung Park
Clinic Director
- Co-founder and joint clinic director
- DDS, Seoul National University School of Dentistry
- Master’s degree, SNU Graduate School of Dentistry
- Former staff, Dept. of General Dentistry, SNU Dental Hospital
- Microendodontics Programme, SNU
- Course completion, UCLA, USA
- Member, UPenn Endodontics Study Club, USA
- Certified Invisalign Provider
- Osstem Implant AIC Programme
- Member, International Congress of Oral Implantologists (ICOI)
Dr. Hyeonjoon Park
Clinic Director
- Co-founder and joint clinic director
- DDS, Seoul National University School of Dentistry
- Master’s degree, SNU Graduate School of Dentistry
- Former staff, Dept. of General Dentistry, SNU Dental Hospital
- Affiliate Associate Fellow, American Academy of Implant Dentistry (AAID)
- Certified Invisalign Provider; leads orthodontic treatment
- Course completion, UCLA, USA
- Member, UPenn Endodontics Study Club, USA
- Member, International Congress of Oral Implantologists (ICOI)
- Member, Seoul Prime Orthodontic Study Club
Dr. Yu Jin Kim
Dentist
- Board-certified specialist, Advanced General Dentistry (Ministry of Health and Welfare)
- Johns Hopkins University, USA
- Master’s degree, SNU Graduate School of Dentistry
- Former staff, Osaka University Dental Hospital, Japan
Dr. Min Ji Choi
Dentist
- Board-certified specialist, Conservative Dentistry
- Board-certified specialist, Advanced General Dentistry
- Internship and residency, Jeonbuk National University Dental Hospital
- Master’s degree in Conservative Dentistry, Jeonbuk National University
Dr. Jin Young Choi
Dentist
- Board-certified specialist, Advanced General Dentistry
- Clinical training, Faculty of Dentistry, University of British Columbia, Canada
- Master’s degree, Kyungpook National University Graduate School of Dentistry
- BA in English Language and Literature, Korea University
Find out what is behind it
Book an English consultation at The Seoul Dental Clinic and tell us which teeth react and to what. We will examine before suggesting treatment.