When Xiaoying and her mother stayed at the Qinyuan Hotel in Heshida, they found a kind of travel in

A. When squeezing the toothpaste, the shape of the toothpaste shell will change, indicating that the force can deform the object, so A is correct;

B. The net content of toothpaste m=3g=, then the net weight of toothpaste G=mg=, but the whole toothpaste contains toothpaste, toothpaste shell and toothpaste cap, so the gravity of the whole toothpaste is greater, so B is wrong;

C. The stripes on the toothpaste cover increase the friction by roughening the contact surface, so C is correct;

D. The gravity of the object is proportional to the mass, when some toothpaste is used, its mass decreases, and the gravity will also decrease, so D is correct

So choose B