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!
Make your own cleaning solution to freshen up dingy tiles around tubs and sinks. Just add a cup vinegar, a cup ammonia, and a cup borax to a gallon of water. Rinse thoroughly with water and allow to air dry.