In 1890, Willoughby Miller, an American dentist working in Germany at the University of Berlin, identified the cause of tooth decay, which is a major cause of toothache. A certain type of bacteria that thrive especially on sugar produce acid that attacks the teeth.
एक विशिष्ट प्रकारचे जिवाणू ज्यांची खासकरून साखरेमुळे भरभराट होते, ते एक प्रकारचे अम्ल निर्माण करतात ज्यांमुळे दात किडू लागतात.