Calprox is a proprietary whitening ingredient made from calcium peroxide, developed by cosmetic dentist Irwin Smigel and used primarily in Supersmile dental products. Unlike many whitening toothpastes that rely on abrasive particles to scrub stains off enamel, Calprox works by dissolving the protein film that holds stains on the tooth surface. This makes it a lower-abrasion alternative for people who want whiter teeth without wearing down enamel over time.
How Calprox Works
Your teeth are covered in a thin protein layer called the pellicle. This layer forms naturally from saliva and acts like a magnet for staining compounds from coffee, tea, red wine, and tobacco. Most whitening toothpastes use abrasive ingredients like silica or baking soda to physically scrub this layer away, which can gradually wear down enamel with repeated use.
Calprox takes a different approach. The calcium peroxide in the formula releases oxygen when it contacts moisture in the mouth. That oxygen breaks down the protein bonds holding stains to the tooth surface, allowing them to be rinsed away during brushing. Because the stain removal is chemical rather than mechanical, the toothpaste can have a much lower abrasivity rating. Supersmile products typically score very low on the Relative Dentin Abrasivity (RDA) scale, which measures how much a toothpaste wears down tooth structure. For comparison, the FDA allows toothpastes with an RDA up to 250, while many whitening toothpastes fall between 100 and 200. Calprox-based products generally come in well under 100.
Where You’ll Find It
Calprox was originally formulated for the Supersmile line of toothpastes, which Smigel created specifically for patients with dental work like veneers, bonding, and crowns. These restorations can be damaged by harsh abrasives, so a gentler whitening mechanism was the goal. Supersmile markets several toothpaste and mouthwash products built around the ingredient.
The same technology also appears in Petsmile, a veterinary oral care line. In pet formulations, Calprox is used to remove plaque, prevent tartar buildup, eliminate bacteria that cause bad breath, and support gum health. Petsmile is notably the first pet toothpaste to receive the Veterinary Oral Health Council (VOHC) seal of acceptance, which requires clinical evidence that a product controls plaque or tartar.
How It Compares to Other Whitening Methods
It helps to understand where Calprox fits among the main approaches to teeth whitening. Each works differently, and they vary widely in strength and potential side effects.
- Abrasive whitening toothpastes use gritty particles to scrub surface stains. They work on external discoloration but can erode enamel over time, especially with aggressive brushing. They do nothing for deeper, intrinsic stains.
- Hydrogen peroxide or carbamide peroxide products (whitening strips, trays, and in-office treatments) bleach the tooth itself, changing the color of the underlying dentin. These are more effective for significant whitening but commonly cause temporary tooth sensitivity and gum irritation.
- Calprox-based products fall between these two categories. They remove surface stains without heavy abrasion, but they don’t bleach the tooth structure the way peroxide-based treatments do. The results are more subtle, essentially restoring your teeth to their natural shade rather than making them unnaturally white.
For people whose main concern is coffee or tea staining and who want to maintain the color of their teeth day to day, Calprox offers a gentle maintenance option. For people looking for dramatic whitening beyond their natural tooth color, peroxide-based treatments will be more effective.
Who Benefits Most From Calprox
The ingredient was designed with specific dental situations in mind. People with veneers, porcelain crowns, or cosmetic bonding are often told to avoid abrasive whitening products because they can scratch or dull the surface of restorations. Calprox allows them to manage surface stains without that risk. People with sensitive teeth or thinning enamel also tend to do better with low-abrasion formulas, since aggressive scrubbing compounds can worsen sensitivity by exposing more of the dentin layer underneath.
That said, Calprox is not a treatment for deep discoloration caused by medications, trauma, or aging. Those types of stains sit inside the tooth structure and require bleaching agents or dental procedures to address. Calprox works only on the external protein layer, so its whitening effect has a ceiling: your natural tooth shade.
Safety and Limitations
Calcium peroxide is generally well tolerated. Because Calprox-based products score low on abrasivity scales, they carry less risk of enamel damage than many mainstream whitening toothpastes. The ingredient has been used in dental products for several decades without significant safety concerns emerging.
The main limitation is efficacy expectations. Marketing for Calprox products can suggest dramatic whitening results, but the mechanism only removes surface-level staining. If your teeth are naturally yellow or have darkened with age, Calprox will not change that. It is best understood as a maintenance tool, one that keeps teeth looking clean and bright between professional cleanings or whitening treatments, rather than a substitute for those treatments.