25NL KK against a paired board

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Villain is 38/10/4 over 100 hands



Full Tilt Poker, $0.10/$0.25 NL Hold'em Cash Game, 9 Players
LeggoPoker Hand History Converter

Hero (MP2): $26.35
CO: $10.25
BTN: $20.45
SB: $39.90
BB: $2.55
UTG: $23.85
UTG+1: $24.25
UTG+2: $27.60
MP1: $25.75

Pre-Flop: K[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/club.gif[/img] dealt to Hero (MP2)
4 folds, <font color="red">Hero raises to $0.85</font>, CO folds, BTN calls $0.85, SB folds, BB calls $0.60

Flop: ($2.65) T[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/heart.gif[/img] (3 Players)
BB checks, <font color="red">Hero bets $1.80</font>, BTN calls $1.80, BB folds

Turn: ($6.25) 7[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero checks, <font color="red">BTN bets $2.25</font>, Hero calls $2.25

River: ($10.75) 4[img]/images/graemlins/club.gif[/img] (2 Players)
Hero checks, <font color="red">BTN bets $6.80</font>, Hero?



I flat call the turn to let 10's and overpairs keep betting at me and to lose the minimum if he's got a 9. Do we fold river, or is our hand underrepped to the point where it's a must-call?