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Histological sections of the periodontal structures of rats photosensitized with 1.0 mg of toluidine blue per ml plus 48 J of laser light (a and b) and control animals which were not irradiated and not treated with toluidine blue (c and d). The sections show normal gingival epithelium (arrow) and sulcular epithelium (arrowhead) abutting the teeth (asterisk) (for clarity, the structures are labeled only on panel b). There is no evidence of ulceration or inflammation.
