Questions.

One question, one page, answered from the published evidence.

• Acidic food and drink triggers: citrus, wine, fizzy drinks and why relief from cold does not last
  The toothpastes with a measured result against cold are the ones built round stannous fluoride, arginine, nano-hydroxyapatite or potassium, and in the 2026 network meta-analysis that pooled 93 randomised trials only stan
• Can you use nano-hydroxyapatite toothpaste every day? Dose, safety and routine
  Yes: morning and night, as your only toothpaste, for as long as you want to use it. The reason is not that hydroxyapatite is natural or biomimetic, but that a European scientific committee has assessed the ingredient twi
• How long to try a sensitivity toothpaste before seeing a dentist
  See a dentist now, whatever week of the tube you are on, if the pain is severe, lingers after the cold has gone, sits in one tooth, hurts when you bite, wakes you, comes with swelling or a bad taste, or is getting worse1
• One tooth suddenly sensitive: crack, filling, decay, or recession?
  When one tooth, rather than the whole mouth, suddenly turns sensitive, the usual causes are a crack, a recent or failing filling, decay that has reached the dentine, or a patch of gum recession, and each tends to leave a
• Sensitive to hot and cold at the same time: what that pattern tells you
  When both hot and cold set a tooth off, the question worth asking is not which one is worse but how long the pain lasts. Sensitivity from exposed dentine is thin and sharp, arrives with the mouthful and leaves with it; p
• Sensitivity getting worse despite a sensitive toothpaste? What to rule out first
  Sensitivity that is climbing while you brush morning and night with a desensitising toothpaste is usually being driven by something the paste was never going to reach, and the list of candidates is short enough to work t
• Sensitivity that lingers after the trigger has gone: what pulpal pain means
  Sensitivity that lingers after the cold or hot drink has gone is usually pulpal pain: it comes from the pulp, the soft core of nerve and blood vessels inside the tooth, rather than from exposed dentine on the surface. It
• Sensitivity with swelling or a bad taste: signs of infection that need treatment
  Tooth sensitivity that comes with swelling, a bad taste, a spot on the gum that weeps, or a temperature is a sign of infection, and a dental abscess needs urgent treatment from a dentist because, in the NHS's words, it w
• Teeth sensitive when brushing: pressure, bristles and the toothpaste that helps
  For sensitivity caused by gum recession, look for a toothpaste whose active has been tested against touch and not merely against cold, because a receded neck of dentine is what the toothbrush lands on. On the tactile pro
• Tooth pain at night: why sensitivity needs a trigger, and what wakes you instead
  Tooth sensitivity is a pain that needs a trigger, so a tooth that wakes you, or aches while nothing is touching it, is pointing to something else, such as an inflamed nerve, an infection, a crack, grinding, a sinus or a
• What percentage of nano-hydroxyapatite does a toothpaste need? What the studies used
  The concentrations that have been tested in people run from 5% to 15%, and no trial has established that one figure inside that range does more than another. Six studies have compared one concentration of hydroxyapatite