I always assumed cuticle oil was just an over-specialized moisturizer, but I've now seen nail technicians claiming that certain types of oils (jojoba is the most common example given) are small enough that they actually penetrate the nail plate to help replenish the natural oils in the structure of the nail. Not only that, but they claim the oil will penetrate through polish to do this. I am skeptical. Can you provide some facts on this? Thanks!