Tooth sealants prior to chelation

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Group,

New member here - first post. I've searched high and low for this

information, but have been unable to find it anywhere.

I have amalgam fillings, and would like to undergo a DMPS challenge

protocol to determine my baseline mercury levels... but the presence

of mercury in my mouth has the potential to confound the results of

this challenge. My naturopath has noted that there is a sealant

available that lasts for a few hours, and can be applied immediately

before the DMPS challenge, but did not provide a trade name for this

sealant, and my regular dentist is at a loss.

Does anyone know the name of the sealant that is used to isolate

dental amalgam during a DMPS challenge? Thanks in advance.