The toothpaste aisle is overwhelming — and the options for sensitive teeth alone could fill a shelf. Here is how to make sense of the choices and find what will actually help.
Why Teeth Become Sensitive
Tooth sensitivity occurs when dentin — the inner layer of the tooth — becomes exposed. This happens when enamel is worn away (from acid erosion, aggressive brushing, or grinding), when gums recede to expose root surfaces, or when a cavity or crack reaches the dentin. The exposed dentin contains tiny tubes (dentinal tubules) that connect to the nerve, and stimuli like temperature, pressure, and sweetness travel through these tubes to trigger pain.
How Desensitizing Toothpastes Work
There are two main mechanisms. Potassium nitrate (in brands like Sensodyne Pronamel and many others) calms the nerve by disrupting the signal transmission inside the dentinal tubules over time. It requires consistent daily use for several weeks before maximum benefit is achieved. Stannous fluoride and stannous chloride (in brands like Colgate Sensitive Pro-Relief) physically block the dentinal tubules, providing faster and more immediate relief. Both approaches are clinically effective.
What to Look For on the Label
Look for active ingredients: potassium nitrate (typically 5%) or stannous fluoride (typically 0.454%). All toothpastes for sensitive teeth should also contain fluoride for cavity protection. Avoid highly abrasive toothpastes (check the RDA — relative dentin abrasivity — value if available; look for below 70 for sensitive teeth). Whitening toothpastes tend to be more abrasive and may worsen sensitivity.
When Toothpaste Is Not Enough
If sensitivity is severe, persistent, or getting worse despite using desensitizing toothpaste, it is time to see your dentist. There may be an underlying cause — a cavity, a cracked tooth, or significant gum recession — that requires direct treatment rather than management with toothpaste alone. In-office treatments including fluoride varnish, dental bonding to cover exposed root surfaces, or gum grafting may be appropriate. Book an appointment at Smileworks Dental in Calgary to get to the bottom of your sensitivity.