Putting toothpaste on a button is an effective treatment.
False. This "grandmother thing" is unfortunately ineffective to make a button disappear and it is the same to prevent them. The toothpaste contains several ingredients that dry and irritate the skin. Indeed, alcohol, triclosan, essential oils, menthol and much more are part of the list of ingredients and will do more harm than good to your skin. Drying the button may seem to help eliminate it faster, but unfortunately it is not.
Bratsis, ME (2017). Acne: Myth vs. Fact. The Science Teacher, 84(4), 17.