I use the Teeth Whitening in Lightroom too. I think it not only boosts exposure but also desaturates a little. If the person already whitens their teeth, it can be a bit strong and I have to tone it down. But usually it's great as-is.
I think they look great. I agree with the other comments. I'm not real crazy about the half-white half-purplish lighting in the background, but it sounds like they chose that spot for a reason so it has significance to them. I wish a couple of the eyes were a little brighter.
As for skin softening, this is what I usually use:
How to Professionally Retouch Portraits in Lightroom - Digital Photography School
I saved those brushes and use them nearly every time I edit an adult's face (children generally don't need it.) There are some brushes already in LR, but I found them to be a little too heavy-handed. These were more natural. I also like editing the skin (pores) separately from creases and wrinkles, as it shows in the tutorial. It's worth a shot to see if that workflow works for you.
I think your clients will be very happy with these!