My husband son is 10 years old needing crowns

My husbands has to pay for half of his son dental bills.   The other day his X called him stating that his ten year old son needs crowns on three back molars  and to get the work done it will cost him over 1000.00.   Okay it is not so much about the money as it is I think the dentist is trying to pull a fast one.

His X wife is stating that his son needs crowns on teeth that do not have any cavities and that the dentist only states that they look like they have the starting of cavities on them.  This sound very hinky to me.   Why would you put crowns on teeth that do not have cavities.   And even if they had cavities I  would think a dentist would do a filling not a crown.

I know his X is just passing on the information she is being told.  She will do whatever the dentist tells her.  However, I am trying to get my husband to see my point and to get a second opinion. In the end we are talking about baby teeth that are going to come out in a year or two.  Come on what is the point of having crowns done on baby teeth?   Is the dentist scamming her?