Oral always feel a little powder teeth off, may be related to the oral calculus partially off, may also be related to dental caries after the disintegration of the tooth tissue off. 1. Partial loss of dental calculus: due to food impaction, teeth, etc. caused by the surface of the teeth plaque retention, food debris accumulation, plaque mineralization will form dental calculus. When the calculus is getting thicker and thicker, there is a possibility that part of the calculus will fall off, and you can feel a little powder coming off the teeth. 2. Dental caries after the disintegration of dental tissue off: caries is a bacteria-based multi-factors under the influence of progressive destruction of dental hard tissues of a disease, manifested in the hard tissues of the body of the tooth is constantly being destroyed, disintegration and the gradual formation of cavities. When chewing and biting, the hard tissues around the cavity will be disintegrated and broken, and the teeth will be partially powdered. If you feel that there is powder coming out of your teeth, you should consult a doctor in time, complete the examination, clarify the cause and diagnosis, and have a standardized treatment by a professional doctor according to the specific conditions of the oral cavity.