A study in the United States suspected that silica gel might cause breast cancer, so the American authorities stopped using silica gel and replaced it with a safer saline bag. In case of leakage, salt water will be absorbed by the body and will not affect health. However, the use of saline bags is not necessarily foolproof. /kloc-in the 1990s, when an American woman went to Canada for a holiday, the sudden drop in temperature caused the saline bag on her chest to freeze, which once caused her to have difficulty breathing and suffocate. In addition, in 2007, a woman in Taiwan Province Province was embarrassed because her right chest was stung by a bee and her saline bag was punctured.