Some toothpastes contain abrasive substances that help remove stains from the tooth surface, but excessive use can damage tooth enamel. Toothpastes with particularly high abrasive levels can lead to sensitivity with long-term use.
Foaming agents like sodium lauryl sulfate (SLS) can cause oral sensitivity and canker sores in some people. Additionally, some artificial sweeteners and colorings can have adverse effects on sensitive individuals. Therefore, it is recommended that people with sensitive teeth and gums choose products with simpler ingredients.