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    Did you mean Sensitization?
    GlossarySensitization

    immune system becomes overly reactive to a substance

    Sensitization refers to the process by which the immune system becomes overly reactive to a substance, often leading to allergic reactions. For example, in the context of hair and scalp health, repeated exposure to certain hair dyes or chemicals can cause the immune system to recognize these substances as harmful, resulting in inflammation or allergic dermatitis upon subsequent exposures.

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