Firstly, this area is a difficult spot to clean, especially if the head of your toothbrush is bulky. It is very easy to skim over, leaving plaque behind. Also, there are saliva ducts present on the floor of the mouth, adjacent to these teeth, so saliva is continually bathing this area.
False because if she rarly exercises than she would not be burning the extra calories she gained and there fore would be gaining an unhealthy amount of weight.