There is often a layer of dental plaque on the surfaces of our teeth, which is filled with bacteria.
Every time we eat and drink , the bacteria will use the sugar of the food and produce acid.
The acid will damage the teeth.
Saliva can reduce acid attacks towards our teeth by neutralizing it and prevent further loss of minerals. However, it must have enough time for saliva to work.
If we eat and drink frequently, saliva will not have enough time to work.The minerals on tooth surface will continue to lose out, and then tooth decay may occur.