If you swish with hydrogen peroxide everyday you will have the same results plus excellent gum tissue! Recommend swishing with peroxide for minutes morning and night. It kills bacteria that causes decay, gingivitis, periodontal disease. Worth a shot!
Love big block/brick in the kitchen. I would build this as the divider between kitchen and living room, with a cook stove on one side and a regular wood-burner on the other. The warmed stone would help keep the house warm long after fires were out.