Health Canada has expanded its list of hair-straightening products that Canadians should not use, after they were found to contain excessive levels of formaldehyde. The professional-grade products are available in hair salons, but are typically not available for sale to the public. Health Canada said it has received complaints of burning eyes, nose and throat, breathing difficulties and hair loss associated with use of professional hair-smoothing products...Formaldehyde has been linked to cancer when inhaled over a long period of time. [refers to Marcia Teixeira (part of M&M International), La Brasiliana (part of Hair Color Research Group), Keratin Complex, Pro Skin Solutions, Inoar]