Did a brief search on pub med to see what I could find about these. It seems that mostly sucrose has been used as an intraoral analgesic in infants and that they're only just developing it for adults. ..
Have a quick read of the following abstracts if you're interested.
http://www.ncbi.nlm.nih.gov/pubmed/16579391
http://www.ncbi.nlm.nih.gov/pubmed/16298489
http://www.ncbi.nlm.nih.gov/pubmed/18476396
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