Nothing can replace a dental health routine that makes brushing and flossing a priority. And if you’re especially particular about having fresh breath and clean teeth, you’re probably using mouthwash, too.

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But according to New York City-based dentist Dr. Azadeh Akhavan, most people might not actually need mouthwash since it’s not as effective a way to rid teeth of plaque compared to the act of physical brushing. However, for some, it can be an important routine addition, especially for people dealing with specific oral health concerns.

For instance, she said that “anyone who is especially prone to caries (cavities) or have dental sensitivity, a fluoride-containing mouthwash can help to strengthen the teeth and prevent cariogenic bacteria from demineralizing the enamel, which is the protective outer coating of the tooth.”

Another reason Akhavan shared is dry mouth, which can be caused by certain medications or treatments. She said this is because bacteria binds more readily to teeth in mouths that are dry, resulting in bacterial colonies that promote cavities or problems with the gums and supporting bone.