Does toothpaste work as a pregnancy test?

By Andrea Rodrigo BSc, MSc.
Last Update: 01/31/2018

Actually, it doesn’t. According to a theory that is spreading across the Internet, this DIY test involves taking a cup of toothpaste and mixing it with a few drops of urine. If you’re pregnant, the toothpaste will supposedly begin to foam.

hCG contains amino acids and toothpaste is composed of a chemical called calcium carbonate. On the one hand, it is true that the combination between calcium carbonate and acid causes the substance to foam due to the production of carbon dioxide and water. So, this theory suggests that the presence of hCG can indeed cause toothpaste to foam.

However, urine contains acids as well, and this is the reason why this home pregnancy test doesn’t actually work. The acid in urine can cause the same reaction in the toothpaste whether you’re pregnant or not.

Recommended for you: Top 10 Historical Methods of Detecting Pregnancy.

Suggested for you: When to Do a Pregnancy Test? – How to Use, Results & Accuracy.

BSc, MSc
Embryologist
Bachelor's Degree in Biotechnology from the Polytechnic University of Valencia. Master's Degree in Biotechnology of Human Assisted Reproduction from the University of Valencia along with the Valencian Infertility Institute (IVI). Postgraduate course in Medical Genetics.
Embryologist. Bachelor's Degree in Biotechnology from the Polytechnic University of Valencia. Master's Degree in Biotechnology of Human Assisted Reproduction from the University of Valencia along with the Valencian Infertility Institute (IVI). Postgraduate course in Medical Genetics.
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