Using expired makeup remover is not advisable for a number of reasons. Firstly, the effectiveness of the product is likely to have diminished. Over time, the active ingredients in the makeup remover can break down, reducing its ability to effectively remove makeup from your skin.

Secondly, expired products can harbor bacteria and other microorganisms, which can cause skin irritations, infections, or even allergic reactions. This is especially true for products that come in contact with your eyes or mouth, such as mascara or lipstick removers.

Lastly, the texture and consistency of the product can change over time, making it less pleasant to use. For example, a cream-based makeup remover may become lumpy or separated, while a liquid remover may become thicker or more watery.

In conclusion, while an expired makeup remover may still be able to do its job to some extent, the potential risks to your skin health outweigh the benefits. It's always best to use products within their recommended shelf life to ensure their effectiveness and safety.