Hello Shaylene,
Thank you for your feedback. While our mouthpieces are reusuable and are included with our breathalyzers, we do recommend purchasing additional ones to use if the others are misplaced or worn out from repeated use.
Please do not hesitate to reach out to us if you have any questions or concerns.
“good to replace the mouth piece every once in awhile (or if someone else is using it). The end that goes it ends up breaking down a bit after a decently long time, but 10 will last you a alooong time”