"口腔卫生学" can be translated as "Oral Hygiene Science" or "Dental Hygiene Science".
"Oral Hygiene Science" emphasizes the scientific study of maintaining oral cleanliness and preventing oral diseases.
"Dental Hygiene Science" also conveys a similar meaning, focusing more specifically on the dental aspect of oral hygiene.
Both translations are acceptable, and the choice may depend on the specific context or preference. In academic or professional settings, "Oral Hygiene Science" might be more commonly used.