Three-year-old baby grinding teeth in bed at night may be due to tension during the day or like to bite toys, or it may be due to dental bite discomfort, bite imbalance, and there may be a lack of calcium, or there are parasites, gastrointestinal tract dysfunction, all these conditions may lead to three-year-old baby grinding teeth at night. For children’s teeth grinding, it may be difficult to carry out treatment, because there is no way to cooperate, the main thing is to treat the symptomatic treatment for the causative factors, eliminate the tension during the day, reduce the bad habits of biting toys and chewing things, you can also supplement calcium, check the gastrointestinal tract for parasites, try to treat the symptomatic treatment.