Forever chemicals, also known as per- and polyfluoroalkyl substances (PFAS), are a group of man-made chemicals that have been used in a wide range of products since the 1940s. They are resistant to heat, water, and oil, which makes them useful for a variety of applications, including nonstick coatings, waterproof clothing, and fire-fighting foam.

However, PFAS have also been linked to a number of health problems, including:

* Cancer: PFAS have been linked to an increased risk of certain types of cancer, including kidney cancer, testicular cancer, and prostate cancer.

* Birth defects: PFAS have been linked to an increased risk of birth defects, such as cleft lip and palate, and low birth weight.

* Immune system problems: PFAS have been linked to a decreased immune response, which can make people more susceptible to infections.

* Thyroid problems: PFAS have been linked to an increased risk of thyroid problems, such as hypothyroidism and goiter.

* Liver damage: PFAS have been linked to liver damage, such as fatty liver disease.

* Kidney damage: PFAS have been linked to kidney damage, such as kidney failure.

* Developmental problems: PFAS have been linked to developmental problems in children, such as delayed growth and learning disabilities.

PFAS are a persistent environmental pollutant, which means that they can remain in the environment for many years. They can also accumulate in the human body over time, which can increase the risk of health problems.

There is no safe level of PFAS exposure. The Environmental Protection Agency (EPA) has set a health advisory level of 70 parts per trillion (ppt) for PFAS in drinking water. However, some scientists believe that even lower levels of PFAS can be harmful to health.

The best way to reduce your exposure to PFAS is to avoid products that contain them. You can also filter your drinking water to remove PFAS. If you are concerned about your exposure to PFAS, you can talk to your doctor.