One hundred and sixteen children, aged 2 to 11 years, who visited Department of Oral Surgery. Okayama University Medical School from July, 1955 to June, 1956 and had more than one deciduous carious teeth of C(3) or higher grade, were investigated and summarized. Forty-three did not have any systemic symptom suspectedly due to deciduous caries, while 71 had some systemic symptoms. The latter group was analyzed accordting to their age and the seasons when they had visited. During the same period, nine cases complaining of unknown fever or some kind of systemic disturbance who visited Pediatric Department first were referred to our Department, suspecting the deciduous caries as their causes. These cases were diagnosed as nephritis, rheumatic fever or allergic sepsis in the Pediatric Department and they had many deciduous caries of C(3) or higher grade. Then it could be found that the systemic symptoms disappeared after these suspicious teeth had been treated.
This fact may reveal that apical lesion was frequently seen following deciduous caries and gave sometimes an onset to the severe systemic diseases
