양치할 때 시린 이: 원인과 집에서 할 수 있는 관리법

A sharp twinge when you brush, sip cold water or eat something acidic can make you avoid brushing properly. Sensitive teeth are very common and can often be eased by changing how you brush and choosing the right toothpaste. Sometimes, though, sensitivity is a sign of decay or a cracked tooth that needs a dentist. This guide explains the causes, home care and when to get checked.

Why do teeth hurt when you brush?

Under the hard enamel lies dentine, which contains tiny channels leading to the nerve. According to the UK's Oral Health Foundation, when enamel wears away or gums shrink back, dentine becomes exposed and the tooth turns sensitive (Oral Health Foundation).

Hot, cold, sweet or acidic food, and even toothbrush bristles, can then trigger pain. The pain is usually short but can sometimes last longer. The American Dental Association (ADA) also notes that once dentine is exposed, acidic or sticky foods can reach the tooth's nerve (MouthHealthy – ADA).

Common causes of sensitive teeth

• Brushing too hard or using a hard brush: wears enamel and damages gums over time.
• Gum recession: exposes the root surface, which has no enamel.
• Acid wear: from fizzy drinks, fruit juice, citrus fruit or stomach acid.
• Brushing straight after acidic food or drink.
• Gum disease.
• Grinding or clenching: the NHS says worn or broken teeth from grinding can increase sensitivity (NHS).
• Decay, cracked teeth and worn fillings: listed by both the ADA and Vinmec (a Vietnamese source).
• After whitening: usually only temporary sensitivity.

Often more than one cause is involved, so if sensitivity does not ease, let a dentist find out why. If you are planning to whiten at home, read blue light teeth whitening at home.

How to brush with sensitive teeth

The Oral Health Foundation recommends a soft toothbrush and gentle brushing in small circular movements. The ADA also advises a soft-bristled brush and gentle pressure to reduce the risk of gum injury (ADA). These four habits are a good starting point:

1. Use a soft-bristled brush: replace it once the bristles fray.
2. Brush gently, do not scrub sideways: angle the bristles toward the gumline and use small circles rather than hard back-and-forth strokes.
3. Use a sensitive toothpaste: brush twice a day, spit but do not rinse with water.
4. Wait after acidic food or drink before brushing: the Oral Health Foundation advises waiting at least 1 hour.

You do not need to stop brushing the sensitive area. Plaque left along the gumline can lead to gum disease and make things worse; just brush more gently.

How to use sensitive toothpaste properly

• Choose the ingredients: the Oral Health Foundation suggests toothpastes containing potassium citrate, potassium nitrate or stannous fluoride.
• Use it regularly: these toothpastes work by blocking the dentine channels, so you need to keep using them to maintain the effect. The ADA notes that several applications are usually needed before sensitivity drops.
• Apply it to the sore spot: at night, you can rub a small amount onto the sensitive area and leave it on.
• Do not rinse with water after brushing.

Vinmec advises asking a dentist to choose the right product. If toothpaste is not enough, a dentist can apply a fluoride or desensitising gel in the clinic.

Can you use an electric toothbrush or water flosser with sensitive teeth?

Yes, as long as you use them gently. What matters is soft bristles and light pressure, not whether the brush is manual or electric.

• Electric toothbrush: choose a gentle or sensitive mode, let the head vibrate and glide slowly, and do not press. Mode names are just the maker's labels, not a treatment for sensitivity.
• Water flosser: start at the lowest pressure, use lukewarm water if cold water triggers pain, and increase gradually as you get used to it. Read more in what PSI is right for a water flosser.

For manual versus electric brushes, see are sonic electric toothbrushes any good.

When should sensitive teeth be checked by a dentist?

According to the Oral Health Foundation, see a dentist if:

• The pain is severe.
• Sensitivity lasts more than a few weeks.
• Only one tooth is affected.
• The pain comes on suddenly.

The NHS also advises seeing a dentist if toothache lasts more than 2 days, does not go away with painkillers, or comes with a high temperature, pain when biting, red gums, a bad taste or a swollen cheek or jaw (NHS).

Depending on the cause, a dentist may apply a desensitising treatment, recommend a high-fluoride toothpaste, place a filling over worn areas near the gumline, treat gum disease, perform a gum graft for recession, or carry out root canal treatment when sensitivity is severe and persistent. Vinmec stresses that treatment depends on the cause, so a proper diagnosis comes first.

Inmax products for sensitive teeth

• M1: 120–140 Hz electric toothbrush, the lowest frequency in the M range, so the vibration is gentle; 5 modes including Sensitive; 1,200 mAh battery, IPX7.
• M3: the same 5 modes as M1 (including Sensitive), 248–320 Hz, with 2 extra brush heads in the box; 1,200 mAh battery, IPX7.
• M5: 20,000 vibrations per minute, 4 modes including Sensitive and Gum Care; slim 199.4 mm body.
• M149Art: water flosser with 30–120 PSI, starting at 30 PSI, lower than other M149 models; 5 modes including Custom, with a UV light inside the 300 ml tank.

You can compare specifications or contact Inmax for advice. Shops and clinics interested in stocking them can see the dealer policy.

Frequently asked questions

Do sensitive teeth go away on their own?

Sensitivity after whitening is usually temporary. For other causes, gentler brushing and sensitive toothpaste may help; if it lasts more than a few weeks, see a dentist.

How long does sensitive toothpaste take to work?

It varies. The ADA says several applications are usually needed, and you need to keep using it to maintain the effect.

Can an electric toothbrush make sensitivity worse?

The electric brush itself is not the cause. Brushing too hard and stiff bristles are the usual culprits, so choose a soft head and let the brush do the work.

Should I rinse right after acidic food?

Rinsing with plain water is fine, but wait at least 1 hour before brushing, as the Oral Health Foundation advises.

This article is for general information, compiled from the linked sources; it does not replace advice from a dentist.