Review (1/5): Uses CPC, can cause loss of taste!
Warning - ACT advanced care has CPC as the active ingredient. While it is very effective and deemed safe by the FDA, it has been known to cause many people to lose their sense of taste. This happened to me, and after a week I have had to discontinue using the product. For some people, it has taken weeks to have their taste restored. This is a known issue, just search "CPC loss of taste". It has mostly been attributed to Crest Pro-Health, but this product also uses the same active ingredient, and it causes the same issue. Some have also complained about teeth being stained after usage.
Beware.