I am trying to decide what is the best throwing weapon for Jaheira to use. I am not sure I have all the facts straight.

Darts are fast because you get 3 attacks per round. But keeping an inventory of them is a pain because they get used up so fast. I have the Crimson Dart from WK. I do not know if it gets 3 attacks per round also. But at least it never gets used up. Slings do much more damage (+3 sling and +2, +3 or +4 ammo) but they only attack once per round. I will have the Fire Tooth dagger when I hit the underdark soon. I do not know if it gets more than 1 attack per round when thrown. If it does it looks like the winner.

I am using the Crimson Dart for now and plan to use Fire Tooth when I get it - depending on the advice I get. I do have a +3 sling I could use.

So which is the 'best' throwing weapon for Jaheira to use?

The Sling of Seeking with the Bag of Bullets from WK is probably the best, followed by Fire Tooth and Crimson Dart, IMO.

Personally, I think Jaheira is better off wading into the melee with Ironskins than standing off, but hey, that's just me...

...and Beren, presumably...

IMO, Jae is the best with Belm and Spectral Brand.

But missile, for me it's Fire Tooth, though you get it a bit late and in TOB it's practically useless.

Spectral Brand with Shield and Iron Skins to go ... ;)

Firetooth for other situations. e.g. Adamantite Golems, interupting stone-skinned mages from afar with the fire damage. etc.

OK, Thanks. Yes, I do not use Jaheira just for ranged attacks. She does double duty based on the situation. I have 2 tanks already and 2 only ranged and 1 mostly ranged. So if there is enough space, Jaheira wades in to melee.
In BG1 and my first go at BG2 I just used her for 90% ranged until I learned something about Iron Skins etc.

But just to make it clear how many attacks per round does Fire Tooth dagger have when thrown?

Fire Tootk counts as a dagger and has a base of 2 attack per round when used as a thrown weapon. Darts have three. The unrepressented items MOd gives you a +5 dagger that can cast 'miscast magic' on it target and is probably best against enemy mages. I once had a halfling mastered in darts and he had 5 attacks with darts which did massive damage, like 20+ per hit (but that's maybe because of some MOD which adds strength bonus to the damage dealt).

BTW, does firetooth get a strength bonus to damage?

Yes, it does, it is a dagger, and daggers/throwing axes/hammers have such a bonus .

The most interesting thing is that, for example, Kensai bonuses apply, as well.