Scientists say more than 40,000 parasites and 250 types of bacteria are exchanged during a typical French kiss.
The study says couples also exchange 0.7 grams of protein, 0.45 grams of fat and 0.19 grams of other organic substances.
The results come from a study carried out to publicise the advantages of good oral hygene in Sweden.
Swedish pharmacies taking part in the campaign are also looking for a couple to break the world record in kissing on Valentine's Day.
The marathon kiss will be broadcast live on the Swedish Pharmaceutical Association's website on February 14.
They say they want to urge responsible kissing which can have advantages as well, for example if the couple chosen beat the last record they will have burned an estimated 7,436 calories.
The current French-kissing record is held by Louisa Almedovar and Rich Langley, from New Jersey, who kissed for 30 hours, 59 minutes and 27 seconds in 2001.
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