The inside of the tooth always feels scraping the tongue, which should be caused by the section of calculus shedding. It means that there is a lot of calculus in the mouth, so it is recommended to go to the dentistry department of a regular hospital for cleaning, which is also commonly known as scaling. Because calculus is an important gathering place for plaque, which is the culprit of periodontal disease and will continue to re-form on the tooth surface after removal. If plaque is not removed properly and mineral salts in saliva are gradually deposited, dental calculus is formed over time, and plaque is in close contact with the tissue surface, causing inflammation of periodontal tissue. In addition, the porous structure of calculus also easily absorbs a large number of bacterial toxins, and calculus also hinders brushing, which may cause gingivitis and periodontitis if it is not removed for a long time. Bleeding teeth, bad breath, and eventually loose teeth, must be taken seriously enough. For some people with heavily worn teeth, the formation of sharp tongue tips on the lower back teeth can also feel like scraping the tongue.