Usually, teeth that are too long can theoretically be ground shorter, but it is generally not recommended.
Teeth grinding will not only cause some damage to the enamel and dentin, but also cause some irritation to the pulp nerve. Shortened teeth may expose the dentin, resulting in tooth sensitivity and soreness, and too much shortening may cause pulpal inflammation or even necrosis, so shortening is generally not recommended.
If it is because the teeth are too long to affect the aesthetics, it is recommended to go to the stomatology department of a regular hospital, consult with a dentist, and through clinical examination, x-ray examination, taking models, measurements, etc., to develop a suitable program, such as orthodontic treatment, crown restoration and so on.