Color correction or color profiles on T2I

Hi everyone!

I´m a dentist and for 15 years I´ve been documenting my clinical cases in my office. I´ve been through the Sony Mavica´s, a couple of superzooms from Olympus and Panasonic (with adapted manual ring-flashes) and in the last years I upgraded to a T2I with a Macro 100 USM lens and a MR-14EX ring flash, so, now, it´s been easier and faster and better to take my intraoral and extraoral pictures.

My problem is:

With my older cameras, the JPG output would give me a... colder... color profile... if I may say this way.

With My T2I + Macro 100 + MR-14EX, my pictures are nicer, but they´ve got a too warm tone. This makes the teeth look more yellow than they really are. The gums look strong red, opposed to pale red/pinkinsh that I used to have in the old days...

I´m not a photoshop user. I´ve got a freeware software for editing images called paint.net and I´ve been messing with the channels to try to make the pictures.. colder... I´ve been adjusting (decreasing) the red/green curves and increasing the blue curve, and it improves it, but I can never get the colors I used to have with my older cameras. Color-wise speaking only, I prefer my older cameras tones...

And I don´t have time/patience o shoot raw and later edit it, so I always use the straight from camera JPGs...

So, is there a way for me changing IN-CAMERA the ... color profile, color output of my picures? They are nice, detailed, but too warm.. The teeth always look yellower!!!

Thanks for reading it all, and I appreciate any help!

Rodrigo