To put this finding, into perspective we can examine the, Stephan curve which is used in dentistry to illustrate how frequency. Of food or drink intake is just as if more, not, as important the presence of this food or drink in the mouth when it comes. To cavity formation (Stephan, & Hemmens 1947), see, Figure 1 whenever a child puts food or drink his mouth this causes,, A drop in the pH of the mouth. The mouth has a neutral pH, of 7 with a critical pH of 5.5. This pH of 5.5 is termed the. "Critical pH" because below this pH is the danger zone "where tooth structure begins to break down during the caries process. (Stephan & Hemmensi). Therefore frequency repeated and prolonged exposure,,, with along increased access to feeding while. Bed sharing may invoke a significant or several prolonged drops in the pH of the child 's mouth. This significant pH drop. Increases the total time throughout the night spent in the "danger zone" of the Stephan curve. Dental research has shown. This drop in pH is especially significant if there is already plaque on the teeth that can then result in cavity formation. (ronezu et al, 2006).
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