Core Viewpoint - The article discusses the importance and various aspects of toner in skincare routines, highlighting its role as a foundational product for hydration and skin preparation. Group 1: Toner Overview - Toner, also known as astringent or lotion, is a basic skincare product used after cleansing to replenish moisture and adjust skin pH to a weakly acidic state, preparing the skin for subsequent skincare steps [3][4]. - The main functions of toner include hydrating the skin, soothing it, and enhancing the effectiveness of other skincare products [3]. Group 2: Choosing the Right Toner - For dry skin, moisturizing toners containing ingredients like hyaluronic acid and glycerin are recommended to retain moisture [4]. - Oily skin types should opt for astringent or oil-control toners with alcohol or witch hazel to manage oil and minimize pores [4]. - Sensitive skin requires gentle, soothing toners with ingredients like chamomile or ceramides, avoiding alcohol and fragrances [4]. Group 3: Common Misconceptions - Misconception 1: More toner is better. Overuse can burden the skin; moderation is advised [5]. - Misconception 2: Toner is only for post-cleansing. It can be reapplied throughout the day, especially in dry environments [5]. - Misconception 3: Thicker toners are more moisturizing. Moisturizing ability depends on the concentration of hydrating ingredients, not thickness [6]. Group 4: Product Selection Tips - Avoid blindly pursuing high-priced products; the best choice is one that suits individual skin needs [6]. - Check ingredients to avoid irritants like fragrances and dyes, particularly for sensitive skin [6]. - Consider product reputation and brand credibility when selecting toners [6]. Group 5: Seasonal Usage - The need for seasonal adjustments in toner usage depends on skin type and product type. For example, dry skin may require richer toners in winter and lighter ones in summer [10][11]. - Oily skin should use astringent toners in summer and can switch to more hydrating options in winter [10][11]. Group 6: Storage and Shelf Life - Toners should be stored away from direct sunlight to prevent active ingredient degradation, ideally in a cool, dark place or refrigerator [12]. - The typical shelf life is 2-3 years unopened and 6-12 months once opened; any changes in color, texture, or smell indicate it should be discarded [12][14]. Group 7: Toner vs. Other Products - Toner cannot fully replace lotions or masks; its moisturizing ability is limited compared to lotions, which lock in moisture, and masks, which provide intensive care [15][16]. - Toner serves as a foundational step, while lotions and masks complement its function for comprehensive skincare [16].