I've been reading your site, great! I'm a manicurist and I was researching to update my talk with a client who had dark patches (blood) under her very thick callus after a vacation (she goes too long between care and wears inappropriate shoes for her work). I really appreciate the information on so many issues clients come in with and the inaccurate information they are often given by friends and the internet... I've seen so many who have thick nails diagnosed with "fungus", that of course is never cured... the only mention I might make is of sanding down thick toe nails, the often more fibrous layers under a thick nail sometimes lead, when the nail is thinned too much, to the nail coming apart... that can lead to other sometimes more serious problems.
Glad to see the peroxide, Listerine, tea tree oil question addressed!
Thank you for clear and concise information!