Signal White Now is a toothpaste that is designed to whiten teeth and provide tooth decay protection. Here are some details about the product based on the search results:

Positive:

• Teeth instantly appear whiter, noticeable after just one brushing.
• Provides tooth decay protection of a regular fluoride toothpaste and freshens breath.
• Contains effective ingredients such as activated charcoal, adenosine, AHAs (Alpha Hydroxy Acids), and algae.

Negative:

• No negative aspects were mentioned in the search results.

Ingredients or materials:

• Hydrogenated Starch Hydrolysate, Aqua, Hydrated Silica, Sodium Lauryl Sulfate, PEG-32, Aroma, Cellulose Gum, Sodium Fluoride, Sodium Saccharin, PVM/MA Copolymer, Mica, Trisodium Phosphate, Glycerin, Sodium Lauryl Sulfate, Lecithin, Caprylyl Glycol, Limonene, CI 74160, CI 77891.
• Other ingredients listed in the search results include Zinc Citrate, blue covarine, and a variety of other ingredients such as cellulose gum, aroma, and more.

It is important to note that the ingredients listed may vary depending on the specific product and location.