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Why teeth and gums can feel tender, and when to ask a dentist.
Tender gums are common, and the cause is often something ordinary. Here is a plain-language walk through the usual explanations, what tends to help, and the signs that mean it is time to book an appointment.
The jolt when cold water hits is not the whitening working. It is a signal about the tiny channels running through the tooth — and once that lands, the whole category reads differently.
The sharp, electric jolt when cold air hits a tooth is the reason most people abandon whitening. It is also the part that is most avoidable.
It is not just decades of coffee. There is a structural change happening underneath, and it explains why the same whitening products stop delivering.
Most enamel damage from whitening does not come from one dramatic mistake. It comes from several reasonable-sounding habits stacked on top of each other.