The high sucrose and casein (H-SC) diet induces predominantly slight to moderate periodontal lesions in maxillae and mandibles in rice rats after 12 and/or 18 wks. Degree of periodontal lesions in maxillae of male rats (A) and mandibles of female rats (B) fed the standard (STD) or the H-SC diets for 6, 12 and 18 wks. An inflammation scoring system was used, ranging from 0–4, where 0 corresponds to no histological lesions, 1 to slight, 2 to mild, 3 to moderate and 4 to severe inflammatory lesions affecting some or all of the periodontal structures. Details regarding this scoring system are described in Table 2. Each symbol represents an individual rat. Horizontal lines represent the median for each experimental group.