Dental General de6bbe81 False about syphilis is : A Incubation period is 9-90 days B Secondary syphilis is due to hematological dissemination C Syphilitic ulcers(Chancre) are extremely painful D "General paresis of Insane" is due to CNS involvement in tertiary syphilis. High-Yield Explanation Syphilitic ulcers(Chancre) are usually single in number, butter like, hard in consistency and typically painless.