Sensitive Teeth: Why Cold and Heat Hurt and How to Stop the Pain

The Main Causes of Sensitive Teeth

Why does the protective layer disappear? There are several culprits, ranging from lifestyle habits to medical conditions.

1. Incorrect Brushing Technique

Ideally, you should massage your gums, not scrub them. Applying too much pressure or using a hard-bristled toothbrush can wear down enamel and push the gums back (traumatic recession). This exposes the sensitive tooth necks.

2. Receding Gums (Gingivitis & Periodontitis)

Gum disease causes the gum tissue to pull away from the teeth, exposing the roots. Since roots do not have hard enamel protection, they are incredibly sensitive to temperature changes.

3. Acidic Diet

Frequent consumption of soda, citrus fruits, or energy drinks attacks the tooth structure. This enamel erosion thins the tooth's outer shell until the sensitive dentin is revealed.

4. Teeth Grinding (Bruxism)

As discussed in previous articles, grinding your teeth at night acts like sandpaper. Over time, it wears off the enamel on the chewing surfaces and near the gum line, leading to chronic sensitivity.

5. Dental Procedures

Sometimes, orthodontic treatment (braces) can shift teeth in a way that thins the bone and gum coverage, leading to sensitivity.

Symptoms and Diagnosis

The symptoms are classic: A short, sharp flash of pain triggered by:

• Cold or hot drinks/foods.
• Sweet or sour foods.
• Cold air hitting the teeth.
• The touch of a toothbrush.

At the Dentist: Your dentist will perform a visual exam to rule out cavities or cracked teeth. They will measure your gum line to see if receding gums are the culprit and check for "erosion lesions" (wear spots) on the enamel.

Therapy: How to Treat Sensitive Teeth

The good news is that sensitivity is highly treatable. The method depends on the severity of the damage.

1. At-Home Relief (Desensitizing Products)

For mild cases caused by harsh brushing, switching to a soft toothbrush and using a desensitizing toothpaste is often enough. These pastes contain compounds (like potassium nitrate or stannous fluoride) that block the dentin tubules, stopping the pain signal from reaching the nerve.

2. Fluoride Varnishes & Sealing

If the enamel is thin, the dentist can apply a high-concentration fluoride varnish. This strengthens the tooth and helps remineralize the surface. For deeper wear, the dentist might use a plastic sealant or bonding agent to physically cover the exposed dentin tubules, providing an instant barrier against cold and heat.

3. Fillings for Exposed Roots

If the tooth neck has a deep notch (wedge-shaped defect) from aggressive brushing or grinding, a tooth-colored composite filling can be placed. This covers the sensitive area and restores the tooth's shape.

4. Surgical Intervention (Gum Grafts)

In severe cases where the gums have receded significantly, a gum graft may be necessary. This involves taking tissue from another part of the mouth (usually the palate) and surgically placing it over the exposed root. This not only stops sensitivity but also protects the tooth from falling out.

Prevention: The Right Technique

The best cure is prevention. To stop enamel loss:

• Don't Scrub: Use a circular, sweeping motion from "red to white" (gums to teeth).
• Wait after eating: Do not brush immediately after eating acidic foods (wait 30 minutes) to avoid brushing away softened enamel.
• Use Soft Bristles: Avoid medium or hard brushes; they are too abrasive for modern diets.

The symptoms of sensitive teeth are always the same: when drinking and eating hot and cold food and drinks immediately a pulling toothache. It does not last long, but disappears immediately. This short, pulling pain is a so-called irritant pain. Through the exposed dentinal tubules a connection between the outer tooth layer and the inner life of the tooth, the tooth pulp, has been established. In it runs the tooth nerve, which reacts very sensitively to stimuli of all kinds. When cold or heat hits the tooth nerve, it reacts with a warning signal to the body to signal that something is wrong. The tooth hurts. When the external stimulus flow stops on the tooth nerve, it stops sending warning signals and the pain disappears as suddenly as it has come.

Tooth seal on sensitive teeth

If only the tooth enamel is attacked, but there is still no caries, it is advisable to seal the sensitive teeth. Probably the simplest method in this case is the application of a special fluoride varnish. He is carefully brushed on the tooth and not only closes the dentinal tubulus (and thus prevents the direct connection to the pulp) but also helps by the contained fluoride in the remineralization of the enamel.

In cases with particularly deep furrows, such as are most commonly found in molars, and when the enamel is already severely worn mechanically (e.g., by teeth grinding), a special plastic filler is used. Today, these plastics are additionally mixed with fluorides, which additionally serves caries prophylaxis. It is believed that a dental seal usually holds between fifteen and twenty years. However, this should not be a pass for bad oral hygiene, because a seal protects only a small part of the teeth, which is often difficult for the toothbrush to access.

Especially with children, this type of dental sealing of permanent teeth is already recommended as a prophylactic when breaking the molars, as their oral hygiene is often not sufficiently guaranteed and in the furrows quickly caries can arise. The statutory health insurance generally undertakes the sealing of up to eight molars in children and adolescents under the age of 18 years. Even if the costs are covered, a prophylactic sealing of teeth is not always useful. You should discuss this individually with the dentist.

Conclusion

You don't have to skip your ice cream or morning coffee. Whether it's a simple switch in toothpaste or a small procedure to cover an exposed root, sensitive teeth can be fixed. If the pain persists for more than a few days, schedule an appointment to rule out more serious issues like decay.