The chances of transmitting syphilis through kissing are not particularly high. More than 90% of acquired syphilis is transmitted through sexual intercourse, but there are still a few people who can contract syphilis through non-sexual means, such as through kissing, blood transfusion, breastfeeding, etc. It can also be transmitted directly. In rare cases, syphilis may be transmitted indirectly through towels, razors, cigarettes, utensils, toys, clothing, medical equipment, etc., contaminated with syphilis spirochetes. But through daily contact, the chances of transmitting syphilis are not that great, so even in close contact in life, the probability of transmission is not high, so there is no need to worry excessively about being infected and repeatedly checked.