The “ACP” in the product name stands for “amorphous calcium phosphate,” a proprietary blend from Philips Oral Healthcare that is designed to provide safe relief to sensitive teeth. Relief ACP is primarily included in other Zoom take-home products, such as Nite White and Day White whitening kits, though it is available for purchase on its own.

The active ingredients in the gel are:

Potassium nitrate (5%) – provides the instant sensitivity relief

ACP & Fluoride – rebuild tooth enamel