Vanillin provides a sweet solution for chronic wound healing
news.flinders.edu.au
news.flinders.edu.au
There are several other metals whose salts are sweet, including beryllium and yttrium, which is why an alternative name for beryllium was glucinium, from the Greek word for "sweet".
maybe not so sweet after all
Some sort of clove extract is used in dentistry as an temporary fix if a full root canal isn't feasible at the time. Got the tiniest whiff of that on my tongue during rinsing and it tasted downright toxic.