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Why is my saliva foamy?
Saliva being foamy means that not enough water is present in the saliva. Saliva contains mucoproteins and glycoproteins, when there is not enough water, this can cause foaminess.
The most likely cause is simply that you are dehydrated and not taking enough water. This is simply tested and remedied, you should take a lot of water. You should take at least 8 large glasses of water daily. This is very likely to make your saliva normal again.
Saliva can also be foamy if you are using medicines like antihistaminics, some forms of anti hypertensives, some kidney drugs, etc. If you use any medicines, you should consult with your doctor about whether these drugs can cause you to be dehydrated.