yea i use to get that, i just use to clean it and my teeth every morning as soon as i got up
i don't think there is much else you can do tbh
This is why I had my traintracks out after a month... I used to have a constant disgusting taste. Turned out to be a plaque build up I couldn't deal with behind the plastic bit on the top of my brace, which I couldn't remove at all.
Anyway, it'll just be something like that. At least you can remove the retainer.
i had a dream last night that i started wearing my retainers again, due to this thread... haha
Basically the saliva that is trapped in the retainer congeals overnight and then 'goes off'. Apparently this is normal. Although I agree it sounds and tastes awful!