Chlorine is a chemical that is used to disinfect swimming pools and other bodies of water. It can be harsh on hair, causing it to become dry, brittle, and discolored.
There is some debate about whether or not it is necessary to wash chlorine out of your hair after swimming. Some experts believe that it is not necessary, as the chlorine will eventually evaporate on its own. However, others believe that it is best to wash chlorine out of your hair as soon as possible to prevent damage.