I tried using Xylitol as a sweetener in my green tea, but it did very little to sweeten the taste, even with relatively large amounts. I was determined to stick with it because of the dental health benefits, but my gf promptly switched back to stevia for her tea. I started growing jealous about how much better her tea was than mine, and eventually I said the hell with xylitol and switched back too. Just my experience.
I am interested in trying Spry though, maybe it works better in a gum.
FO, are you drinking your green tea hot or cold? I usually drink mine cold & find that I don't need very much Xylitol at all... about 1 gm per 8 oz of green tea. If you've got more of a sweet tooth, then perhaps 2 gm of Xylitol per 8 oz serving of cold green tea might be more to your liking. I find that even unsweetened cold water can satisfy a craving for a sweet drink so, perhaps a cold drink requires less sweetening than a hot one.
I mistakenly bought a xylitol-stevia mix (NOW Foods) recently rather than the pure Xylitol that I usually get. The Xylitol-Stevia mix cost a little bit more than the pure xylitol but perhaps a similar mixture would suit your needs... you'd still get the dental health benefits along with the taste that you prefer.
I've found that Altoids is using Xylitol in their sugar-free (Cinnamon) chewing gum. Xylitol appears as the first ingredient with a couple of other sugar alcohols (Sorbitol & Mannitol) high on the ingredients list. Note that this gum also has 2 artificial sweeteners (Sucralose & Acesulfame K) much lower on the list. I don't really know if artificial sweeteners pose any health risks or not, but I use so few products that contain them that I really don't worry about it too much at all.