Yes, it is possible to use a Pantene conditioner without using the matching shampoo. Pantene products are designed to be effective individually, so you may choose to mix and match based on your hair's specific needs and preferences. The conditioner can still provide hydration, smoothness, and nourishment to your hair, even if you pair it with a different brand of shampoo. However, for optimal benefits, Pantene recommends using their products as a system since the complementary formulas are designed to work together to achieve the best results for your hair type. If you have specific goals in mind, such as addressing dryness or damage, selecting products tailored to those concerns may further enhance the effectiveness of your hair care routine. It is always helpful to read the guidelines on the Pantene website for more information.