In addition to the picturesque appearance of someone sleeping with their mouth open, this habit poses a risk to the oral cavity, which dries out and loses the protective effect of saliva.
Do you tend to sleep with your mouth open? This is a habit that can be as damaging to tooth enamel as drinking a sugary soda just before bed.
Scientists from the University of Otago in New Zealand discovered that when the mouth is left open during sleep, the saliva dries up and the antibacterial protection of saliva in the mouth is lost.
As the oral cavity loses the protective effect of saliva, the pH of the mouth becomes increasingly acidic, which favors the development of tooth decay. Scientists estimate that the damage done to the teeth when we sleep with our mouths open is equal to the damage that occurs after consuming a sugary drink just before bed (and when we have not brushed our teeth).
Under normal conditions, the pH of the mouth is 7.7, i.e. neutral, the researchers explain. But when we sleep with our mouth open the pH of the mouth becomes more acidic, 6.6, while in some participants during the relevant experiment the pH reached 3.6.
According to the researchers, the problem is more severe in the back teeth because the mouth is drier there. Also, the problem is more intense in men as they sleep more often with their mouths open compared to women.