I have two front teeth that are longer than my other teeth. Can they be 'reshaped' or filed down? (photo)

From the pictures, they don't seem to be even close to "1 centimeter" longer than the laterals (side teeth).  The difference in length seems to be closer to 3mm.  Depending on where your smile line is, Yes you can file down a central by 2 mm without any problem.  The worst that can happen may be a little temporary sensitivity.But be careful about shaving then too much in relation to your smile line.  

Most of the time they can be easily reshaped. Procedure is called enameloplasty, it's quick and painless if done within enamel. If preparation extends in to dentin a small composite (white) filling may have to be placed there to protect tooth from cavities and sensitivity.