i do oral and if i saw any type of sore on my client i would not do it i am not aware the risks are high, 
don,t think you would get many clients offering just oral. Good luck anyway the girls will be along with more info than me.

Thank you!  I do offer more than just oral, its just that if I can, I prefer to spend time that way then a full half hour or hour of sex.....

What exactly do you say to them once you have noticed any sores?

It would be very bad form for any punter to turn up with cold sores, even the beginnings of one (and I admit I've never had one, but from what I've been told, you know when you're getting one). There's no way you can sensibly let their mouth anywhere near you, which puts kissing out of bounds as well - I did have a booking like this once in a town I was passing through briefly and the punter was very apologetic but wanted to see me so we managed without the kissing but it was definitely harder to fill the time. I don't like RO so I'm not bothered if they don't want to do it, but I find bookings with no kissing very hard work.

If I notice anything amiss anywhere (sores, rashes, odd smells and so on - you can smell a strep throat often too which puts me off) I just politely mention it and explain that x and x services won't be available and if they look bewildered I can give them a hand mirror and show them. I've only had to do that once though - most wouldn't dream of turning up like that, or not without telling you anyway. It is possible to pick up herpes when a carrier has no visible sores as they can still be shedding the virus, but if you're in otherwise good health you'd have to be pretty unlucky .

What about dental dams? Has anyone used them? I see you can buy flavoured ones but wouldn't know how to use it, plus it might look a bit awkward and turn the client off?

As for best brand, no idea still testing out all the non latex and extra thin latex..

Woofy, I've moved your post here since it's not really anything to do with the topic of the one you added it to.

I have a couple of dental dams kicking about somewhere, although I think I've only ever had people ask for them twice (I bought a pack of five or six so long ago I can't even remember where I got them). I'm fairly sure most punters would rather not bother, but as ever if you want to use them the most important thing is to make it clear in your ads that all your services are protected and I'm pretty sure if it's for rimming (on them or you) most would understand. They do cover the whole area so I would think they're pretty effective at reducing even the herpes risk .