Deb hit the nail on the head, Solar oil helps promote flexibility and the moisture content, while Toughen up helps reinforce the structure of the natural nail. They are meant to go together.Do-it-all Deb said:I'm no good at the technical explanation, so hopefully geeg will help you there, but I believe the two products complement each other. The solar oil to help promote the growth and the toughen up to strengthen the new growth. I have certainly promoted these two products together so I really hope I'm on the right track!
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