Around 4 months of age, your Lab puppy will begin replacing the milk teeth with adult teeth. At 6 to 7 months, the full set of 42 permanent teeth will be in.
(plural strike rates) ( 1 baseball) the number of runs of a batter divided by the number of balls faced. ( 2 cricket) the number of runs scored by a batsman per 100 balls faced; the number of balls bowled by a bowler divided by the number of wickets taken.  Link/Cite.
rate 1. 1. the amount of a charge or payment with reference to some basis of calculation: a high rate of interest on loans. 2. a certain amount of one thing considered in relation to a unit of another thing: at the rate of 60 miles an hour. 3. a fixed charge per unit of quantity: a rate of 10 cents a pound. 4. degree of speed or progress: to work at a rapid rate. 5. assigned position in any of a series of graded classes; rating.