Tooth sensitivity at the gumline Gum disease
Sharp sensitivity to cold at the gumline usually means an exposed root. Roots lack enamel, so cold, sweet and touch reach the nerve through tiny tubules. Recession, hard brushing and the healing after deep cleaning are the common causes. Desensitizing toothpaste helps; a gum graft covers the root permanently.

Why are my teeth sensitive after a deep cleaning?
As inflamed gums shrink after scaling and root planing, more root is exposed and freshly cleaned. Sensitivity usually eases over weeks, faster with a desensitizing toothpaste.
How is root sensitivity treated?
- Desensitizing toothpaste with potassium nitrate or stannous fluoride.
- Fluoride varnish or bonding at the dental office.
- Gum grafting or Pinhole to cover the root.
Questions
Is sensitivity a sign of gum disease?
It can be a sign of recession, which often accompanies gum disease. It can also come from a cavity or a crack, so it needs an exam.
Sources
Gum disease Read next
GingivitisGingivitis is inflammation of the gums caused by plaque at the gumline.
PeriodontitisPeriodontitis is a chronic infection that destroys the ligament and bone holding the teeth.
Bleeding gumsBleeding gums are the most common early sign of gum disease.
Gum painGum pain most often comes from inflamed gums, food or debris trapped under the gum, a periodontal abscess, or brushing too hard.
Loose teethAn adult tooth that moves has lost support.
Bad breathMost chronic bad breath (halitosis) starts in the mouth: bacteria on the back of the tongue, in gum pockets and under old dental work release sulfur compounds.