第四，关于免疫防龋，激光防龋，使用防龋涂料等，现仍在试验阶段。
The fourth, the methods in using immunization, laser and coating material to prevent caries are still being carried out in tests.
第四，关于免疫防龋，激光防龋，使用防龋涂料等，现仍在试验阶段。
The fourth, the methods in using immunization, laser and coating material to prevent caries are still being carried out in tests.
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