Plaque, debris and bacteria that process on the surface of the tooth at a certain time will turn into lactic acid that decreases the pH of the mouth. This condition will cause caries. So the plaque should be cleaned by brushing your teeth properly. There are several techniques to brush teeth, one of them is fones technique. This study aims to describe the changes in the pH of saliva before and after brushing teeth by using fones technique.This type of research is quasi experimental with pretest and posttest design.The sampling technique uses purposive sampling with the number of samples are 49 respondents. Instrument in this research is observation sheet and pH meter. The data analysisis presented in the form of frequency distribution table. The results showed that almost half of the respondents (47%) had an acid saliva pH before performing tooth-brushing action with the fones technique. After doing the tooth brushing technique, it was found that most respondents (63%) had neutral saliva pH.The conclusion is that there is a good change between before and after brushing with the technique of fones, which is from base to neutral by 12% of respondents and from acid to neutral by 33% of respondents. The author advised the respondents to apply the fones techniques when brushing their teeth, then for UKGS schools to apply the fones technique when implementing a joint toothbrush program.