Tooth sensitivity is one of the most common dental complaints, affecting an estimated one in eight adults. The sharp, momentary pain triggered by cold drinks, sweet foods, or cold air can range from mildly annoying to significantly disruptive. Understanding what causes it is the first step to addressing it effectively.
Sensitivity occurs when the dentine layer of the tooth becomes exposed. Dentine is the softer tissue beneath the hard outer enamel, and it contains thousands of microscopic tubules that lead to the nerve. When dentine is exposed and stimulated by temperature, pressure, or acidic or sweet foods, the fluid in those tubules moves, triggering the nerve and causing the characteristic sharp sensation.
Dentine becomes exposed through several routes.
Enamel erosion. Acidic foods and drinks, acid reflux, and frequent vomiting can gradually dissolve enamel. Once enamel is lost, it does not regenerate.
Gum recession. When gum tissue pulls away from the tooth, the root surface, which has no enamel covering, becomes exposed.
Aggressive brushing. Brushing too hard with a firm-bristled brush wears away enamel at the gum margin and can cause gum recession over time.
Cracked or chipped teeth. A cracked tooth can expose dentine and sometimes allow fluid and bacteria to reach the nerve directly.
Whitening treatment. Some patients experience temporary sensitivity following teeth whitening, which resolves within a few days.
Decay or a damaged filling. These require clinical attention and should not be managed with sensitivity toothpaste alone.
Sensitivity toothpastes containing potassium nitrate or stannous fluoride can provide meaningful relief over several weeks of consistent use by blocking the dentinal tubules or calming the nerve. They work best when used as the last step in your oral hygiene routine, not rinsed away immediately.
Avoiding highly acidic foods and drinks, and rinsing with water after consuming them rather than brushing immediately, helps protect the enamel that remains.
Sensitivity that is new, worsening, localised to a single tooth, or accompanied by a lingering ache rather than a brief sharp sensation warrants a dental appointment. These signs suggest the cause may be a crack, decay, or damage that sensitivity toothpaste will not resolve.
At Berkhamsted Dental, we use digital X-rays and a dental operating microscope to identify the precise cause of sensitivity and recommend the most targeted treatment. Book a check-up and get a clear answer rather than managing the symptom indefinitely.
Whether you’re booking your first appointment, have a question about our treatments, or simply want advice on your dental care — our friendly team is here to help.
