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When I teach basic training, one question I often seem to get is what to use to wipe the lens if powder gets on it. I don't like to use paper towels or anything that can be abrasive. I thought about using the soft cloths you can get at a LensCrafters so you would not scratch the lens, but I didn't want to have a ton of them and have to keep washing them after every patient.

I found these disposable lens-cleaning cloths in my local pharmacy. We tear one off when we are ready to do a CEREC. When I'm looking at the monitor and see that I have a spot of powder on my lens, I don't even have to look up. I just remove the camera from the patient's mouth, my assistant quickly removes the powder, and I'm right back to taking pics.

Once we are done with all the images, we just toss the cloth we used. Here is a pic of the brand that I found. I'm sure that there are many different brands out there. I just know that it can be costly to replace a scratched lens, so we make sure to keep these around for every case.