My 41/2 year old has been taking Singulair for about 2 years. It ...

My 41/2 year old has been taking Singulair for about 2 years. It has done wonderful things related to her asthma. But she does complain of frequent stomach pains which I see others also have. However, she is not saying she has severe aching in teeth. She says it is not one tooth but moves around and it hurts. she refuses to eat any food that forces her to chew. And I believe her teeth really do hurt because she is refusing food I know she really likes. Anyone else having tooth sensitivity?