England's new national selector Smith believes it is "the ideal moment" to reintroduce Buttler to Test cricket.
"The first thing we talked about as a selection panel - and it coincided with one of my first trains of thought coming into the job - was how could we..."
Butler who has been on 20/20 duty in India last played a test match in the fifth Test against India in Chennai.
England's spin role had become vacant after Jack Leach, Bess' Somerset team-mate, suffered a broken thumb in the nets on Monday and was ruled out for a month.
Jonny Bairstow, who succeeded Buttler as England's Test keeper, has retained his place behind the stumps having become a mainstay of skipper Joe Root's side with both bat and gloves.
In 13 matches for Rajasthan so far, Buttler has scored 548 runs at an average of 54.80 and a strike rate of 155.24.
Jos Buttler has been recalled to the England Test team for the first clash with Pakistan. The selection panel feels that this is the flawless moment to reintroduce Jos to Test cricket, where he has already enjoyed some success, including a stint playing as a specialist batsman at number seven.
While Bess has received an England call after just 16 first-class appearances, Buttler is back in the frame for a 19th cap after a break of nearly 18 months but on the back of his brilliant Indian Premier League form. "Jos is playing with great confidence and flair, and he will bring unique qualities to the Test team", he said.
Bess so far has taken a solitary wicket in two County matches this season, but he had routed Essex with 6 for 51, playing for MCC earlier this season. In all likelihood, as the sole spinner in the 12 man party, Bess will make his Test debut at the Home of Cricket next week.
"Dom Bess has made an excellent start to his first-class career", Smith said.
"Dom's strong form, character and all-round abilities presented a compelling case for selection", Smith said.
Other English players who will accompany Buttler on the flight back to England are Ben Stokes, Chris Woakes and Mark Wood (already back).