That spell isn't in the game yet: if you look at the spell's wiki page you'll see "Note: Not currently in game (Timeline: Nov. 2001).". You just have to use the Circle of Great Divide for now.
As for the tooth, it's completely separate from the spell. Every player, whether or not they're a porter, needs a tooth to be able to port/get ported to the Velious dragon circles (ie. every Velious port except Iceclad) The teeth are cumulative, so if you get the one from Wakening Lands you can throw out the one from Great Divide, because the WL one will let you port to the GD circle. To get them you just have to visit the appropriate dragon circle: they're lying on the ground in the middle of the circle.
The point of the whole system is to make you have to visit each circle on foot at least once before you can teleport to it. This prevents players from getting ported to content they couldn't access otherwise. For instance, a player who has a Skyshrine key can't teleport a player who doesn't to Cobalt Scar, because the second player needs a CS tooth and can't get one without visiting CS (which requires the Skyshrine key).
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