Dental calculus is usually caused by long-term poor hygiene habits. The common causes of dental calculus are as follows. 1, poor oral hygiene habits: not to brush your teeth on time, regular check-ups, or not to master the correct method of brushing, not to rinse your mouth after meals. Not brushing your teeth in time can lead to the deposition of substances that form calculus, which is conducive to the formation of calculus. Brushing time is too short, or not to clean all aspects of the teeth carefully, so that the substances that form calculus remain, can also form calculus in some special locations of the teeth. 2, dental problems: uneven teeth, large gaps, rough tooth surface is also a factor in the formation of calculus. It is very difficult to clean the teeth in the sunken parts of the teeth with uneven alignment and inside the gaps that have become bigger. It is difficult to clean all the teeth because the brushing method only cleans the teeth at the level, and it is easy to develop calculus. The above-mentioned reasons can easily lead to the appearance of dental calculus, which often leads to bleeding gum tissue and oral odor, so it is recommended to go to a regular hospital to remove the calculus in time, which is beneficial to the health of periodontal tissue.