Cold water never bothered me in my twenties. Now one icy sip can find a tooth like it has GPS. Annoying, but usually explainable.
So what is the honest answer?
Sensitivity often increases with age because gums recede, enamel thins, and old dental work changes.
Gum recession exposes root surface, which is not protected like enamel. Enamel wear, grinding, acidic drinks, and tiny cracks can also open pathways toward the nerve.
The part people usually miss
Use a desensitizing toothpaste daily, switch to a soft brush, stop sawing at the gumline, and ask about grinding if you wake with jaw tension. Sudden sensitivity needs a dental visit.
My rule is boring and useful: change one thing, watch what happens, and stop if your mouth gets irritated. Teeth respond better to steady habits than to panic routines before weddings, photos, or dentist appointments.
How I would handle it this week
- Take a baseline photo in bathroom lighting you can repeat.
- Keep brushing gentle at the gumline, soft bristles only.
- Do not stack three new products at once, because then you cannot tell what helped or hurt.
Related reading: this guide and this review or article both go deeper on the practical side.