fluoride opal glass

例句：

1. 1. The water in the bottle contains fluoride to prevent tooth decay.
   瓶子里的水含有氟化物，以防止蛀牙。
2. 2. Fluoride is a common additive used in toothpaste to strengthen teeth.
   氟化物是牙膏中常见的添加剂，用于强化牙齿。
3. 3. The fluoride treatment helps to reduce the risk of bone fractures in people with osteoporosis.
   氟化物治疗有助于降低患有骨质疏松症的人骨折的风险。