The colour in my implanted teeth has changed.

Iam 34 year old girl .i have one implanted teeth at upper jaw front teeth.it placed before 9 years ago.now it have colur change from others.and also i havent 2 teeth at lower jaw so am placed teeth by 6 unit.i have fear about it .if there have any chance to fall out all these .my marriage on next month .what i do i havent any confidence to smile and other.please help me.And my all teeth and gums are very week.help me please