S u can fill them with cosmetic​treatment or Orthodontic treatment. No Problems with strength of the tooth

There are many treatment modalities that can be applicable for your case and can give you permanent lifelong results without weakening the teeth in anyway. But the most important thing to understand is that the applicability of any treatment option in your case can be evaluated only after a proper clinical evaluation. So it will be prudent that you make a visit to the dentist so that case evaluation can be completed and the treatment options can be explained to you. Regards

Everything will be fine if you go for orthodontic/clips treatment, depending on the case