Apart from checking the expire date, there are two other methods to check if a mascara has expired. Smell the contents of the bottle and if you perceive a pungent or very pungent smell, the oils contained are almost certainly spoiled. Another method is to take a small amount of product with the bottle brush and place it on your index finger and rub it with your thumb. If you notice small lumps and a little compact consistency, it is better to replace the cosmetic with a new one.