Enamel Strengthening

Dental Erosion

Dental erosion resulting from extrinsic and intrinsic acids is increasingly seen in young and adult patients. The most common causes are extrinsic acids from acidic sodas and energy drinks. Acidic foods, some medications, and intrinsic acids due to gastro-esophageal reflux disease (GERD) or bulimia, also cause dental erosion. With more advanced dental erosion, patients may present with teeth that have "rounded off" or indented areas, thinner incisal edges, or teeth that appear darker (caused by shine-through of the dentin). If the dentinal tubules are open, the patient may also have dentinal hypersensitivity. As dentin is softer than enamel, it is also eroded more rapidly than enamel.

Enamel Strengthening

Enamel strengthening can help to prevent acids from affecting tooth structure and may help to prevent erosion from starting. Fluoride toothpaste with Liquid Calcium like ARM & HAMMER Complete Care Plus Enamel Strengthening helps strengthen enamel. ARM & HAMMER Complete Care Plus Enamel Strengthening contains ACP (amorphous calcium phosphate) technology that delivers both fluoride and calcium. And, because baking soda neutralizes the acids that cause erosion, it helps return intraoral pH to a normal level. Rinsing with water after drinking or consuming acidic drinks and foods helps remove extrinsic and intrinsic acids, and rinsing with water and baking soda helps neutralize the low intraoral pH caused by these acids.

This chart shows ARM & HAMMER™ Complete Care™ Plus Enamel Strengthening toothpaste provided an 87% increase in remineralization of acid eroded enamel over a standard sodium fluoride/silica toothpaste. All fluoridated toothpastes demonstrated increased enamel remineralization over the placebo. Pre and post-enamel hardness data is shown.

Experimental Design

Artificial lesions were formed in bovine enamel specimens by a 72-84-hour immersion into a solution of 0.1 M lactic acid and 0.2% Carbopol which was 50% saturated with hydroxyapatite and adjusted to pH 5.0. The lesion surface hardness ranged from 25-45 and average lesion depth was approximately 70μ. Dentifrice slurries were prepared by adding 5.0 g of dentifrice to 10 g of deionized water. The cyclic treatment regimen consisted of a 4.0 hour/day acid challenge in the lesion-forming solution and four one-minute dentifrice treatment periods. After the treatments, the specimens were rinsed and placed back into a remineralizing solution for the remaining time (~20 hours). The regimen was repeated for 20 days. At the end of the 20-day treatment regimen, the fluoride content of each enamel specimen was determined and each was tested for surface hardness changes. The difference between the hardness following treatment and initial lesion hardness is an indication of the ability of that treatment to enhance remineralization.

Data on file. RD-10-268, 3/8/11