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Applying high frequency or ultraviolet rays to the hair and scalp is especially appropriate before the application of a preparation containing alcohol. This is because alcohol can be drying and may strip the hair and scalp of moisture. High frequency treatments are often used to enhance the absorption of products into the scalp and can help to stimulate blood circulation, which can prepare the scalp for product applications. Using these treatments ahead of applying alcohol-based products can ensure that these products work more effectively while minimizing potential irritation or damage to the scalp and hair.

Utilizing ultraviolet rays or high frequency after applying hair products may not be ideal, as the products could potentially inhibit the effectiveness of these treatments. Likewise, performing these treatments before styling with heat tools is not recommended, as heat can affect the efficacy of high frequency or UV treatments. During hair cutting services, the primary focus is on the haircut itself, and applying these treatments may not be relevant or necessary at that time.