To find the total amount of salt used in both kinds of bread, you can simply add the amounts of salt used in each type.
For the soda bread, they use 5 grams of salt.
For the whole wheat bread, they use 8 grams of salt.
Now, add these two amounts together:
\[ 5 \text{ grams} + 8 \text{ grams} = 13 \text{ grams} \]
Therefore, Dale and his grandmother use a total of 13 grams of salt in all.