it is important to find soft toothbrushes made especially for babies and to use them very gently.是say的宾语,也就是一个宾语从句.it is+形容词+to do sth是动词不定式做主语.it是形式主语,动词不定式是真正的主语即to find soft toothbrushes 和to use them very gently.made especially for babies 是过去分词做toothbrushes 的定语.