OER Commons: A digital library offering a variety of open educational resources, including textbooks and course materials for dental hygiene and health sciences.
Open Textbook Library: Provides free access to a variety of textbooks on health sciences, including topics relevant to dental hygiene.
2. Online Courses and Lectures
Coursera: Offers free courses on health sciences, biology, and other related topics from top universities. Auditing courses is usually free.
edX: Provides free courses on various health science topics from institutions like Harvard, MIT, and others.
FutureLearn: Offers free courses on health sciences and related fields.
Saylor Academy: Provides free courses on health sciences, biology, and chemistry.
3. Textbooks and Reference Materials
Project Gutenberg: Offers free access to many classic texts on science and health topics.
Google Books: Provides previews and free access to a range of books on health sciences and dental hygiene.
4. Research and Journals
Google Scholar: A freely accessible web search engine that indexes scholarly articles across various disciplines, including dental hygiene.
PubMed Central (PMC): A free archive of biomedical and life sciences journal literature, including research in dental hygiene.
Directory of Open Access Journals (DOAJ): Contains free, full-text, quality-controlled scientific and scholarly journals, including those focused on dental and health sciences.