Dentins is a 7 letter English word. It's valid Scrabble word worth 7 points. It's valid Words with friends word worth 9 points.
You can make 152 anagrams from letters in dentins (deinnst).
First recorded in 1830-40; dent- + -in2
Still, it can easily be renewed, or if all the tin is removed we find the dentin hard and firm.
The effect is to cause the surface exposed to dentin to oxidize more than tin would do alone; in that there is a benefit.
Nature will not restore the lost part, but will do the next best thing—solidify the dentin.