What are the three main categories of oral mucosa?
1) Masticatory mucosa, Lining mucosa, and Specialized mucosa
2) Keratinized mucosa, Non-keratinized mucosa, and Parakeratinized mucosa
3) Stratified squamous epithelium, Simple squamous epithelium, and Ciliated columnar epithelium
4) Gingival mucosa, Palatal mucosa, and Buccal mucosa