Dental professionals don't want you to embed plastic into your gums. The little blue specks in the toothpaste are actually plastic and Crest even says "Polyethylene plastic is in your toothpaste for decorative purposes only."
If you go to the dentist after using this, they could actually have to pick these little beads out from between your teeth AND out of your gums. They actually can sink into your gums.
The dental professional website says "This is unacceptable not only to me, but to many, many hygienists nationwide. We are informing our patients. We are doing research separately and comparing notes. And until Procter & Gamble gives us a better reason as to why there is plastic in your toothpaste, we would like you to consider discontinuing the use of these products."
Click the pic for more info and a list of other toothpastes.