The color of the lining of the healthy mouth is pink, and the tongue licking the oral mucosa tissue feels very smooth. If a patient is a frequent smoker, drinker or betel nut chewer, his oral mucosa is mostly rough. If the patient suffers from diabetes or cardiovascular disease, the gums and oral mucosa may be purplish red or dark black, and the lips may also have an unhealthy color. The color of the inner wall of the oral mucosa determines the health of the oral mucosa. If the oral mucosa appears mottled or white spots, it must be taken seriously, and it is likely that the mucosa has some lesions, and it is necessary to go to the oral mucosa department for pathological diagnosis in time.