I have used tongue ties for years and years. In my early years, I have
worked for trainers that used them on almost all of their horses as common
operating procedure. When I started training, I pretty much believed in a
minimalist view. The less tack the better. If they seem to need it and race
well with tongue tied, I used it. If not, I didn't. You will ride some
jocks that seem to want a tie in every one of their horse's mouths, if they
hear strange throat sounds. I take whatever they say with a grain of salt.
One suggestion, does not a change of tack make. If I run across a horse that
actually "swallowed" his tongue in a race, then that is a pretty much sure
sign that they need one. Those types of horses are a bit rare in the
thoroughbred business. You will see more tongue swallowing in the harness
horse business where a horse's head is checked up high, and they often have
a lot of iron in their mouth etc. Quarter horses seem to be more hyper and
maybe more prone to tongue swallowing than many thoroughbreds, I don't know.
In short, don't be in too big a hurry to pop a tongue tie on your horses.
If you think you need one, make sure you give your horses plenty of time to
become accustomed to one by wearing them in the stall, while galloping, etc.
Don't tie it too tight. A blue tongue is not a good sign. I have found the
leather strap types with buckle to be pretty useful designs. They are less
prone to cutting off circulation.