Three of them are doing just fine. However, one of them has a problem as evidenced by the leaves which look as if someone has held a candle too close to the edges of each leaf and they have become brown and crispy - covering almost half of the leaf, but starting with the outside edge (away from the stem).
Again infants and children normally drool during sleep, but some adults too drool during sleep. Moreover, drooling in case of adult is not always normal. Drooling can be quite common in adult while sleeping. But when awake, drooling in adult can not only be embarrassing but very uncomfortable leading to social and mental burden. The reasons for an adult to drool during sleep can be due to an open mouth, abnormal structure of the mouth like enlarged tonsils, large tongue or overcrowded teeth.
So when these receptors encounter an unfamiliar object in the mouth, such as braces, the brain doesn't initially realize it isnât food. Just give these receptors a little time to adapt and the drooling will stop. Braces can also cause drooling because they simply feel unfamiliar. Your lips don't come together quite like they used to, and you have a bunch of stuff in your mouth getting in the way-it's just harder to swallow all your excess saliva. Once your mouth gets used to your braces, the drooling problem should get better.