ZI
Zima Dental
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Allow Time
I typically would just go get a new retainer given the condition but I gave the Zima dental pod and its tablets a try. It did take quite a while, (less than 3 months) but to my surprise, it did clear up all the old gunk. My top retainer is original and approx 20 yrs old. The bottom is a good 5 yrs old. Just allow plenty of time if you have older gunk.