Related Clues:

• Kind of hygiene
• Like the Sabin vaccine
• Evan-gelist Roberts
• Hurdle for a doctoral student
• Not injected
• Like some exams
• Something to explain your way through
• Type of exam
• Type of history
• By word of mouth
• Dentist’s procedure
• Like some ancient history
• Type of vaccine
• Like some tests
• Mouth-related