Some toothpaste brands do have corn in it or in them.
The corn in toothpaste is corn derivatives.
The corn derivatives that are in some toothpaste brands is sorbitol, which can be used in toothpaste to provide flavor as well as thicken and stabilize the toothpaste and even act as a sweetener in the toothpaste.
Not all toothpastes though contain corn or corn derivatives.
But if you have a corn allergy or sensitivity to corn you should check the ingredients list on the toothpaste to see if it has sorbitol or any similar corn derivatives.
Colgate toothpaste is a toothpaste that does contain corn derivatives.
Squigle is a toothpaste that is corn free.
You can buy Squigle toothpaste on Amazon.
Corn-derived ingredients like sorbitol are common in many brands of toothpaste, because they help give toothpaste its flavor and moisture, but they can be a concern for people with a corn allergy.
Some brands of toothpaste may use non-corn sources for ingredients like sorbitol, but others use corn derivatives without making it obvious on the label.