Yes sugar contains calories.
Yes, but you can give them sweets about three times a week. It's acually good to give them a lot of sweets without rotting their teeth because if you give then something sugary before you ride, they will be more softer on the bit.
yes
yes
Yes.
yes
yes
True
True
If you feed a horse alot of sugary treats, yes. One or two is OK once in a while though.
yes on howrse yes
It sure can! The horse will get cavities in its teeth if you feed it too many sugary treats.
Yes,their teeth are made of enamel just like ours,which makes them prone to cavities too.