Salivating only on one side

[TakeAChance]

Just wondering if anyone else has experienced this; my horse salivates quite a bit when being ridden, but only on one side. It's not an excessive amount but just seems odd that it's one sided and not evenly spread around his lips. He goes nicely in an outline on the left rein (this is the side he salivates out of!) but resists a bit more on the right rein. Also if you look at the bit, it's got marks on it like he's biting it on the side he's salivating from.

I know his teeth are ok because he had some wolf teeth out a few weeks ago and had a full dental whilst under sedation. Could this be a sign that he's uncomfortable or is this just what some horses do?

Thanks for reading

 

[TakeAChance]

Anyone?

 

[Horseochondriac]

Bit late to the party here but I have the same issue! Did you ever find out what was happening?