enamel opaque spot meaning in English

釉质白垩斑

Objective ： to prevent enamel opaque spot after orthodontic etching
目的：预防口腔固定正畸酸蚀牙釉白斑的发生。
Conclusion ： fluoride treatments can reduce the incidence rate of enamel opaque spot after orthodontic etching
结论：氟化处理可降低口腔固定正畸患者釉白斑的发生率。
Results ： the incidence rate of enamel opaque spot with the treated group is lower than untreated group , there is significantly statistical differences
结果：经氟化处理的牙齿，釉白斑的发生率低于对照组，有显著性差异。