Hello TLC,
SFQ works on all problems but you may also want to try a cure which works very well and has produced no side effects at all along with your SFQ healing.
Simply put a bit of LISTERINE mouthwash - the original yellow one, all around the nail and under the nail if possible, let it soak in and air dry naturally. If it is fingernails put Listerine in a small bowl and soak the fingernails in it.
Do this daily - it works extremely well and doing your SFQ will make it work faster.
Love and light
Faune