Normal oral cavity is light pink, oral whitening may be candidiasis, lichen planus, white spots, oral mucosal fibrosis lesions. 1. Candidiasis: acute pseudomembrane type candidiasis oral cavity can appear a thick layer of yellowish-white pseudomembrane, can be wiped away with pain, microscopic mycelium and spores. 2. lichen planus: most common in menopausal women, manifested as the inner wall of the oral cavity appearing net-like white strips, there is a wooden astringent burning sensation, irritation pain, can be accompanied by skin damage. 3. White spots: white spots are white patches in the oral cavity that can not be erased, can be wrinkled paper-like, plaque-like, self-conscious roughness with numbness and astringency. 4. Oral mucosal fibrosis lesions: is due to the oral mucosa long-term external friction stimulation or long-term chewing betel nut caused by local mucosal keratinization layer thickening, resulting in local whitening, generally no self-awareness symptoms. Oral whitening, it is recommended to go to the hospital in time for examination, timely treatment, to avoid the aggravation of symptoms affecting oral health.