BTW, the use of bleach is not a problem unless you are allergic to it. They use household bleach and have for decades with little harm. It beats the heck out of some of the other stuff is used today. I had a bad mammogram come back and I told the oncologist that if it was cancer, that I had some formaldehyde crap that could be injected into the tumor to embalm/kill it (i.e. the Sargenti Paste they put into my mouth). The doctor said he couldn't use it because it is more dangerous than the chemo drugs!!! AND OUR DENTAL INDUSTRY KNOWS ABOUT THESE FORMALDEHYDE PRODUCTS AND DOES ABSOLUTELY NOTHING TO PROTECT US IGNORANT PATIENTS. I don't happen to remember watching 60 minutes, GMA and Dateline in the mid-90s when they did stories on sargenti paste and how bad it was. Even if I did see them, I have long since forgotten about them. SHAME on our dental industry.