I got fillings a few days ago, and after switching toothpaste, i noticed a grainy feeling in my mouth, like i have sand in thereand idea what it is?

Might be toothpaste: Your new toothpaste might be a little more abrasive than your old toothpaste. As a test, why don't you switch back to your old toothpaste and see if that grainy feeling resolves? Then you'll know for sure if it was the toothpaste.

Could be toothpaste: It could be the toothpaste itself and you got a bad batch. You might want to try another tube of the same toothpaste or try a different brand altogether.

Toothpaste: Some people react to different components in toothpaste- First try your old toothpaste again an see if it is alright. What type of fillings did you have and were they replacements or new fillings?

Toothpaste: Some toothpastes have granules in them to help with the removal of bacteria. Try a different toothpaste , one that doesn't contain any extra ingredients such as "whitening", or "tarter control". If that doesn't resolve the problem, go back to the dentist that placed the fillings.

Dental abrasives: Be careful that dental abrasives are not being used in your toothpaste.

Abrasive ingredient: You think it is after switching your tooth paste, change it. It is probably from abrasive ingredient in the paste. There are material that commenly used during filling to prepare the surface for better boning or simply cleaning also has Sandy feeling.

Change Toothpaste: You should change this toothpaste and use only toothpastes that carry the ADA Seal.

Probably: Probably the new toothpaste. Some are more gritty feeling than others, particularly whitening toothpastes.

Switch back: If you rub a bit of toothpaste between your dry fingers and you can feel the grit, then it's too coarse. Switch to a toothpaste with the ADA seal of approval such as Crest, Fact, Cue, Colgate, or many others.

Grit: could be a filling crumbling at the edges or the abrasive in the tooth paste