How often should I use toner on my face, especially considering the myriad of skin types and concerns that exist? Is there a universal frequency that applies to everyone, or does it vary depending on individual circumstances? For instance, what role do environmental factors, such as humidity and pollution, play in determining the appropriate usage? Furthermore, which specific ingredients should I look for in a toner to achieve my desired skin goals, such as hydration or oil control? Is it advisable to incorporate toner into my morning and evening routines, or would one application suffice? Also, how might the application method—whether through cotton pads or simply with my fingertips—affect the product’s efficacy? What about the potential for overuse and its impact on my skin’s delicate balance? Ultimately, what expert insights or dermatological recommendations exist to help me navigate this seemingly simple yet complex aspect of skincare?