Teeth floated is general maintenance. Just case you had it done once and it “didn’t seem to help” doesn’t mean it didn’t work. Horses teeth constantly grow, and can have tons of different effects, ulcers, bad eating habits, head tossing, choke, colic, abscesses, etc.
You should honestly have teeth floated in my professional opinion as an outfitter every other year at the most, some horses can go a bit longer (as long as they don’t have missing teeth) and can be done at times every 6 months.
Your horse that didn’t show any changes might have needed more follow ups, could use had sever ramps, grooves, hooks, sharp points etc. I had a horse I bought that took 3 sessions in 6’months to get their teeth back to good working order then 8 months to get them back to good healthy normal weight.
A buddies horse looked healthy and was solid, but dropped grain out of his mouth with every bite, we had him done and got his teeth back to almost perfect, still drops grain.
Your 30 year old horse’s most likely need more care on their teeth, they still grow and could have other issues contributing to the weight loss other than teeth that may have originally been caused by the teeth. Ulcers are huge and take a while to fix. It also could be just age and normal for that horse as they are pushing generally way past their normal working life expectations. May be time to simply retire the one or both.
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