Why does whitening gel, for instance Day White ACP, become a dark purple/black color when in contact with amalgam fillings?
This is normal. Based on years of clinical use, it has been proven that the dark purple/black coloration in the whitening tray after bleaching older amalgam fillings is inconsequential. No damaging effects on the amalgam restorations have been experienced. It is thought that the cause of discoloration is the zinc used in old amalgam fillings.
Related Questions
- Has the whitening gel, for instance Day White ACP, been activated before its application if the syringe contains more, small bubbles than usual?
- Why does whitening gel, for instance Day White ACP, become a dark purple/black color when in contact with amalgam fillings?
- Do whitening gel products, for instance Day White ACP, require refrigeration, and how long do they keep?
