The causes of big teeth biting pain are as follows: First, periapical inflammation: it is common that there are deep and large cavities on the crown of big teeth, and the infection of the cavities spreads to the pulp and periapical tissues, which makes a large amount of inflammatory exudate around the root of the tooth, and the pain appears at the root tip when the tooth is subjected to biting stress. Second, tooth cracks: cracks on the tooth surface, or even root fractures, when the tooth is fractured, such as a crown fracture, or even a joint crown-root fracture, there is an inability to bite, or a relatively severe pain when biting. Third, excessive wear: excessive wear of the tooth surface, commonly in people who prefer to eat tougher foods, due to the continuous wear of the enamel, resulting in the exposure of dentin, when biting the tooth will appear when the big tooth pain. Fourth, periodontitis: periodontitis patients will have varying degrees of root exposure and alveolar bone resorption, and even teeth have come out with varying degrees of looseness, which will also lead to toothache when biting.