Laser in cavity fillings still in development phase. U can go for tooth coloured fillings.

If your fillings are coming out frequently within months then you need to check out your occlusion, that means the way your teeth close. Lasers will be for preparing the tooth to receive fillings, it doesn't have any role in longevity of filling material. You require to treat root cause of fillings not staying in place, better to review your existing condition from Dentist properly.