If ur worried about dna in ur spit you can reduce you can reduce the amount if dna material in the sample. Wash your mouth by brushing your teeth, gums, cheeks, lips and tounge. Then for the sample, slowly draw saliva from the glands behind your bottom teeth with slight suction. Once you have enough to spit, do so but do not allow it to touch your whole mouth. Just use the tip of your tounge to push the saliva through pursed lips. I believe most of the genetic material found in saliva is from gum and cheek skin.
If ur worried about dna in ur spit you can reduce you can reduce the amount if dna material in the sample. Wash your mouth by brushing your teeth, gums, cheeks, lips and tounge. Then for the sample, slowly draw saliva from the glands behind your bottom teeth with slight suction. Once you have enough to spit, do so but do not allow it to touch your whole mouth. Just use the tip of your tounge to push the saliva through pursed lips. I believe most of the genetic material found in saliva is from gum and cheek skin.
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