Enamel softening with Coca-Cola and rehardening with milk or saliva.

I. Gedalia*, A. Dakuar, L. Shapira, I. Lewinstein, J. Goultschin, E. Rahamim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

93 Scopus citations


Rehardening effects by cow's milk and by secreted saliva were investigated, in situ, following softening of human enamel with an acidic beverage (Coca-Cola). Volunteers wearing orthodontic removable appliances participated in the study. The intra-oral test was chosen for measuring microhardness of enamel slabs inserted into the dental appliance. The softening and the rehardening degrees were defined as the alterations between initial- and experimental-microhardness value at the enamel surface. In addition, SEM photos were prepared from the initial and experimental stages. Exposure of enamel slabs to the acidic beverage during 1 hour had a softening effect as expressed by the hardness decrease and visualized by the SEM photo. Rehardening effects following milk or saliva exposures respectively were evident, presumably due to deposited organic and mineral material on the enamel surface.

Original languageEnglish
Pages (from-to)120-122
Number of pages3
JournalAmerican Journal of Dentistry
Issue number3
StatePublished - Jun 1991
Externally publishedYes


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