'Oregon Cosmetology State Board Hair Practice Test 2025 – Your All-In-One Guide to Exam Success!'

High frequency current should not be used on hair that has been treated with certain tonics primarily because it may cause adverse reactions due to alcohol present in those tonics. Many hair tonics contain high levels of alcohol, which can be reactive to electrical treatments. When high frequency current interacts with alcohol, it can lead to skin irritation, burns, or other negative effects. This makes it crucial for cosmetologists to be aware of the ingredients in the products they apply, particularly any that could exacerbate sensitivity or lead to harmful reactions when subjected to electrical currents.

Using high frequency with tonics that contain alcohol can not only compromise client safety but also diminish the intended effects of the treatments applied. Understanding the chemical interactions involved helps ensure the safe and effective use of cosmetology practices.